Small update: I've been using the mIDas Gold programme along with a patch.txt file that's revised to accurately reflect our server's IDs to gain some success. We've managed to keep all our redpower microblocks and keep all the marble/basalt blocks. My goal right now is to compare the ID Dump files of our old server and the new one with all the new mods and edit the patch.txt file to correctly configure all blocks.
One thing I haven't been able to figure out: Even though I'm using the Immibis Core mod that comes with 1.4.7 Tekkit Lite, I can not find any Immibis (MFFS) item or block ID's in the ID Dump. Therefore I can't convert any of the old blocks to the new ID.
Also, even though I have replaced all the BC pipe ID's (waterproof/transport pipe, teleport pipe), I get a slew of "skipped tileentity with ID teleportpipe" errors, as well as every single transport pipe in the world has an entity, I can hack it out, but it's invisible, shows no texture or anything, and of course doesn't work.
Finally, certain items seem to have reverted to vanilla textures, like the Redstone or Combustion Engines, World Anchor, Railcraft items, and some others. Updating to a 1.4 version of Sphax seems to completely remove -any- textures as opposed to my current one for 1.3. Am I supposed to install Optifine for this to work?
@Lethosos, as I mentioned in my previous post, all our current mods have already been updated to their 1.4.7 equivalents.