Try using /setblock from the console, if you know or can guess its coordinates. Otherwise, try load the world into a single player world and see how it goes that way. As for MCEdit, it does have a 1.7.10 version which can be seen on they're website

maybe using MCEdit? it might allow you to locate and remove the block, or chunk that the block is located in.
someone correct me if I'm wrong, there might be an easier way .
edit/ unsure if it works with modded worlds

My modpack: Dropbox
Server crash log:
---- Minecraft Crash Report ----
// You're mean.
Time: 7/8/19 9:05 AM
Description: Exception in server tick loop
java.lang.NoClassDefFoundError: powercrystals/minefactoryreloaded/api/rednet/IRedNetNetworkContainer
at erogenousbeef.bigreactors.common.multiblock.tileentity.TileEntityReactorRedNetPort.checkForConnections(TileEntityReactorRedNetPort.java:449)
at erogenousbeef.bigreactors.common.multiblock.tileentity.TileEntityReactorRedNetPort.onMachineAssembled(TileEntityReactorRedNetPort.java:107)
at erogenousbeef.core.multiblock.MultiblockControllerBase.assembleMachine(MultiblockControllerBase.java:336)
at erogenousbeef.core.multiblock.MultiblockControllerBase.checkIfMachineIsWhole(MultiblockControllerBase.java:320)
at erogenousbeef.core.multiblock.MultiblockWorldRegistry.processMultiblockChanges(MultiblockWorldRegistry.java:222)
at erogenousbeef.core.multiblock.MultiblockRegistry.tickStart(MultiblockRegistry.java:25)
at erogenousbeef.core.multiblock.MultiblockServerTickHandler.onWorldTick(MultiblockServerTickHandler.java:20)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_245_MultiblockServerTickHandler_onWorldTick_WorldTickEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at cpw.mods.fml.common.FMLCommonHandler.onPreWorldTick(FMLCommonHandler.java:268)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:620)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:334)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.ClassNotFoundException: powercrystals.minefactoryreloaded.api.rednet.IRedNetNetworkContainer
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 16 more
Caused by: java.lang.NullPointerException

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Linux (amd64) version 4.4.0-151-generic
Java Version: 1.8.0_202, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 576924136 bytes (550 MB) / 983040000 bytes (937 MB) up to 1304952832 bytes (1244 MB)
JVM Flags: 3 total; -XX:MaxMetaspaceSize=200M -Xmx1400M -Xms700M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 13, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 53 mods loaded, 53 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{7.10.99.99} [Forge Mod Loader] (forge.jar)
UCHIJAAAA Forge{10.13.4.1614} [Minecraft Forge] (forge.jar)
UCHIJAAAA appliedenergistics2-core{rv3-beta-6} [Applied Energistics 2 Core] (minecraft.jar)
UCHIJAAAA CodeChickenCore{1.0.7.47} [CodeChicken Core] (minecraft.jar)
UCHIJAAAA OpenModsCore{0.10} [OpenModsCore] (minecraft.jar)
UCHIJAAAA <CoFH ASM>{000} [CoFH ASM] (minecraft.jar)
UCHIJAAAA FastCraft{1.25} [FastCraft] (fastcraft-1.25.jar)
UCHIJAAAA appliedenergistics2{rv3-beta-6} [Applied Energistics 2] (appliedenergistics2-rv3-beta-6.jar)
UCHIJAAAA bdlib{1.9.4.109} [BD Lib] (bdlib-1.9.4.109-mc1.7.10.jar)
UCHIJAAAA ae2stuff{0.5.1.61} [AE2 Stuff] (ae2stuff-0.5.1.61-mc1.7.10.jar)
UCHIJAAAA AgriCraft{1.7.10-1.5.0} [AgriCraft] (AgriCraft-1.7.10-1.5.0.jar)
UCHIJAAAA AppleCore{3.1.1} [AppleCore] (AppleCore-mc1.7.10-3.1.1.jar)
UCHIJAAAA Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar)
UCHIJAAAA CoFHCore{1.7.10R3.1.4} [CoFH Core] (CoFHCore-[1.7.10]3.1.4-329.jar)
UCHIJAAAA ThermalFoundation{1.7.10R1.2.6} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.2.6-118.jar)
UCHIJAAAA ThermalExpansion{1.7.10R4.1.5} [Thermal Expansion] (ThermalExpansion-[1.7.10]4.1.5-248.jar)
UCHIJAAAA BigReactors{0.4.3A} [Big Reactors] (BigReactors-0.4.3A.jar)
UCHIJAAAA qmunitylib{1.0} [QmunityLib] (QmunityLib-1.7.10-0.1.114-universal.jar)
UCHIJAAAA bluepower{0.2.962} [Blue Power] (BluePower-1.7.10-0.2.962-universal.jar)
UCHIJAAAA chancecubes{1.7.10-2.4.1.0} [Chance Cubes] (ChanceCubes-1.7.10-2.4.1.182.jar)
UCHIJAAAA ForgeMultipart{1.1.2.331} [Forge Multipart] (ForgeMultipart-1.7.10-1.1.2.331-universal.jar)
UCHIJAAAA chisel{2.9.5.11} [Chisel] (Chisel-2.9.5.11.jar)
UCHIJAAAA endercore{1.7.10-0.2.0.39_beta} [EnderCore] (EnderCore-1.7.10-0.2.0.39_beta.jar)
UCHIJAAAA EnderIO{1.7.10-2.3.0.429_beta} [Ender IO] (EnderIO-1.7.10-2.3.0.429_beta.jar)
UCHIJAAAA EnderStorage{1.4.7.37} [EnderStorage] (EnderStorage-1.7.10-1.4.7.37-universal.jar)
UCHIJAAAA etfuturum{1.5.5} [Et Futurum] (Et Futurum-1.5.5.jar)
UCHIJAAAA Mantle{1.7.10-0.3.2.jenkins191} [Mantle] (Mantle-1.7.10-0.3.2b.jar)
UCHIJAAAA TConstruct{1.7.10-1.8.8.build988} [Tinkers' Construct] (TConstruct-1.7.10-1.8.8.jar)
UCHIJAAAA ExtraTiC{1.4.6} [ExtraTiC] (ExtraTiC-1.7.10-1.4.6.jar)
UCHIJAAAA iChunUtil{4.2.3} [iChunUtil] (iChunUtil-4.2.3.jar)
UCHIJAAAA inventorytweaks{1.59-dev-152-cf6e263} [Inventory Tweaks] (InventoryTweaks-1.59-dev-152.jar)
UCHIJAAAA ironbackpacks{1.7.10-1.2.20} [Iron Backpacks] (IronBackpacks-1.7.10-1.2.20.jar)
UCHIJAAAA IronChest{6.0.62.742} [Iron Chest] (ironchest-1.7.10-6.0.62.742-universal.jar)
UCHIJAAAA ironfurnaces{1.2.4} [Iron Furnaces] (ironfurnaces-1.2.4R.jar)
UCHIJAAAA Mekanism{9.1.1} [Mekanism] (Mekanism-1.7.10-9.1.1.1031.jar)
UCHIJAAAA magicalcrops{4.0.0_PUBLIC_BETA_4b} [Magical Crops: Core] (magicalcrops-4.0.0_PUBLIC_BETA_5.jar)
UCHIJAAAA mo{0.4.2} [Matter Overdrive] (MatterOverdrive-1.7.10-0.4.2.jar)
UCHIJAAAA numina{1.7.10} [Numina] (Numina-0.4.1.106.jar)
UCHIJAAAA powersuits{1.7.10-0.11.1.117} [MachineMuse's Modular Powersuits] (ModularPowersuits-1.7.10-0.11.1.117.jar)
UCHIJAAAA Morph{0.9.3} [Morph] (Morph-Beta-0.9.3.jar)
UCHIJAAAA NetherOres{1.7.10R2.3.2B1} [Nether Ores] (NetherOres-[1.7.10]2.3.2B1-25.jar)
UCHIJAAAA OpenMods{0.10} [OpenMods] (OpenModsLib-1.7.10-0.10.jar)
UCHIJAAAA OpenBlocks{1.6} [OpenBlocks] (OpenBlocks-1.7.10-1.6.jar)
UCHIJAAAA secretroomsmod{4.7.1} [The SecretRoomsMod] (secretroomsmod-1.7.10-4.7.1.413.jar)
UCHIJAAAA ThermalDynamics{1.7.10R1.2.1} [Thermal Dynamics] (ThermalDynamics-[1.7.10]1.2.1-172.jar)
UCHIJAAAA VeinMiner{0.36.0_1.7.10-28a7f13} [Vein Miner] (VeinMiner-1.7.10-0.36.0.496+28a7f13.jar)
UCHIJAAAA VeinMinerModSupport{0.36.0_1.7.10-28a7f13} [Mod Support] (VeinMiner-1.7.10-0.36.0.496+28a7f13.jar)
UCHIJAAAA witchery{0.24.1} [Witchery] (witchery-1.7.10-0.24.1.jar)
UCHIJAAAA McMultipart{1.1.2.331} [Minecraft Multipart Plugin] (ForgeMultipart-1.7.10-1.1.2.331-universal.jar)
UCHIJAAAA IguanaTweaksTConstruct{1.7.10-2.1.6.163} [Iguana Tinker Tweaks] (IguanaTinkerTweaks-1.7.10-2.1.6.jar)
UCHIJAAAA UniDict{1.7.10-2.9.2} [UniDict] (UniDict-1.7.10-2.9.2.jar)
UCHIJAAAA ForgeMicroblock{1.1.2.331} [Forge Microblocks] (ForgeMultipart-1.7.10-1.1.2.331-universal.jar)
OpenModsLib class transformers: [stencil_patches:ENABLED],[movement_callback:ENABLED],[player_damage_hook:FINISHED],[map_gen_fix:FINISHED],[gl_capabilities_hook:ENABLED],[player_render_hook:ENABLED]
Class transformer null safety: all safe
AE2 Version: beta rv3-beta-6 for Forge 10.13.4.1448
CoFHCore: -[1.7.10]3.1.4-329
ThermalFoundation: -[1.7.10]1.2.6-118
ThermalExpansion: -[1.7.10]4.1.5-248
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.
NetherOres: -[1.7.10]2.3.2B1-25
ThermalDynamics: -[1.7.10]1.2.1-172
List of loaded APIs:
* AgriCraftAPI (1.0) from AgriCraft-1.7.10-1.5.0.jar
* AppleCoreAPI (3.1.0) from AppleCore-mc1.7.10-3.1.1.jar
* appliedenergistics2|API (rv3) from appliedenergistics2-rv3-beta-6.jar
* Baubles|API (1.0.1.10) from ThermalFoundation-[1.7.10]1.2.6-118.jar
* bluepowerAPI (1.0) from BluePower-1.7.10-0.2.962-universal.jar
* ChiselAPI (0.1.1) from Chisel-2.9.5.11.jar
* ChiselAPI|Carving (0.1.1) from Chisel-2.9.5.11.jar
* ChiselAPI|Rendering (0.1.1) from Chisel-2.9.5.11.jar
* CoFHAPI (1.7.10R1.0.13) from EnderCore-1.7.10-0.2.0.39_beta.jar
* CoFHAPI|block (1.7.10R1.1.0) from MatterOverdrive-1.7.10-0.4.2.jar
* CoFHAPI|core (1.7.10R1.3.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHAPI|energy (1.7.10R1.0.13) from EnderIO-1.7.10-2.3.0.429_beta.jar
* CoFHAPI|fluid (1.7.10R1.3.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHAPI|inventory (1.7.10R1.0.13) from EnderIO-1.7.10-2.3.0.429_beta.jar
* CoFHAPI|item (1.7.10R1.0.13) from EnderIO-1.7.10-2.3.0.429_beta.jar
* CoFHAPI|modhelpers (1.7.10R1.1.0) from MatterOverdrive-1.7.10-0.4.2.jar
* CoFHAPI|tileentity (1.7.10R1.3.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHAPI|transport (1.7.10R1.0.13) from EnderCore-1.7.10-0.2.0.39_beta.jar
* CoFHAPI|world (1.7.10R1.3.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|audio (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|gui (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|gui|container (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|gui|element (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|gui|element|listbox (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|gui|slot (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|inventory (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|render (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|render|particle (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|util (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|util|helpers (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|util|position (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|world (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* CoFHLib|world|feature (1.7.10R1.2.1) from CoFHCore-[1.7.10]3.1.4-329.jar
* EnderIOAPI (0.0.2) from EnderIO-1.7.10-2.3.0.429_beta.jar
* EnderIOAPI|Redstone (0.0.2) from EnderIO-1.7.10-2.3.0.429_beta.jar
* EnderIOAPI|Teleport (0.0.2) from EnderIO-1.7.10-2.3.0.429_beta.jar
* EnderIOAPI|Tools (0.0.2) from EnderIO-1.7.10-2.3.0.429_beta.jar
* MatterOverdrive|API (0.4.1) from MatterOverdrive-1.7.10-0.4.2.jar
* MekanismAPI|core (9.0.0) from Mekanism-1.7.10-9.1.1.1031.jar
* MekanismAPI|energy (9.0.0) from Mekanism-1.7.10-9.1.1.1031.jar
* MekanismAPI|gas (9.0.0) from Mekanism-1.7.10-9.1.1.1031.jar
* MekanismAPI|infuse (9.0.0) from Mekanism-1.7.10-9.1.1.1031.jar
* MekanismAPI|laser (9.0.0) from Mekanism-1.7.10-9.1.1.1031.jar
* MekanismAPI|reactor (9.0.0) from Mekanism-1.7.10-9.1.1.1031.jar
* MekanismAPI|recipe (9.0.0) from Mekanism-1.7.10-9.1.1.1031.jar
* MekanismAPI|transmitter (9.0.0) from Mekanism-1.7.10-9.1.1.1031.jar
* MekanismAPI|util (9.0.0) from Mekanism-1.7.10-9.1.1.1031.jar
* OpenBlocks|API (1.1) from OpenBlocks-1.7.10-1.6.jar
* VeinMinerApi (0.3) from VeinMiner-1.7.10-0.36.0.496+28a7f13.jar
Chisel: Errors like "[FML]: Unable to lookup ..." are NOT the cause of this crash. You can safely ignore these errors. And update forge while you're at it.
EnderIO: Found the following problem(s) with your installation:
* The RF API that is being used (1.7.10R1.3.1 from <unknown>) differes from that that is reported as being loaded (1.7.10R1.0.13 from EnderIO-1.7.10-2.3.0.429_beta.jar).
It is a supported version, but that difference may lead to problems.
* An unknown AE2 API is installed (rv3 from appliedenergistics2-rv3-beta-6.jar).
Ender IO was build against API version rv2 and may or may not work with a newer version.
This may have caused the error. Try reproducing the crash WITHOUT this/these mod(s) before reporting it.
AE2 Integration: IC2:OFF, RotaryCraft:OFF, RC:OFF, BuildCraftCore:OFF, BuildCraftTransport:OFF, BuildCraftBuilder:OFF, RF:ON, RFItem:ON, MFR:OFF, DSU:ON, FZ:OFF, FMP:ON, RB:OFF, CLApi:OFF, Waila:OFF, Mekanism:ON, ImmibisMicroblocks:OFF, BetterStorage:OFF, OpenComputers:OFF, PneumaticCraft:OFF
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 5; [EntityPlayerMP['Gameknight14'/308, l='Biome Bundle', x=60.79, y=64.87, z=55.78]]
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)