I know the answer is probably here in the thousands of pages but

cuda65vpt said
Definitely want to go big bolt. Right now I have 10" drums in the front and 9" in the rear because my original 7 1/4 started rattling and I replaced it. Will the whole rear out of a Grand Cherokee work with modifications? Welding spring perches etc.

No, they're to wide, you need an A-body 8.25 rear but the stuff I posted earlier will work just fine.