Alright, it's actually not as hopeless as you might think, I just ported my world from 7.1. What I did was copy the .cfg files from my last backup into the new folder, from the "config" and "buildcraft" folders or anywhere else there were .cfgs. I had to copy over my last save, though, since when I opened it up before that, I guess the game replaced all the invalid blocks with empty space. Not sure if this was unique to me, but I also ran into an ID Resolver prompt before the main menu, and I pressed "Automatically assign ids to all". I also had been messing around with installing other mods, and had downloaded Forge 3.3.7 from their website.
