Pre 99 solid axles will be 1.5" shorter overall.
Try and find a 99+.
I can't be much help because I purchased everything new. From what I've read, it's pretty much a straight up swap. Everything will just bolt right up. You will have to swap out the axles (of course), the catback exhaust, driveshaft, and e-brake cables. That's pretty much it. Oh, and of course the springs and shocks.