Thanks for the replies, fellas. I think I've heard enough positive testimonies for the 7.5" that I'll just use the one I got. If it ain't broke don't fix it, right? Well... fix it a little so it don't break, I guess.
I'll probably try to find a used locking diff- maybe one of those zexel-torsen ones from the f-bodies, a set of gears, and maybe a support cover... That oughta do it. I hope
Thanks again for the input, guys.