Gota 79 malibu with the 7.5 later ill build a 400-500 bigblock for it. but i want to get the rear done 1st and out of the way. anyone know the easiest and cheapest rear to put in without alot of fab work. would a 8.5 with a spool and gears be good enough, if so what cars came with 8.5 thatll fit right in??