There are several ways to get lift in the rear, longer shackles, shackle relocation brackets, the above mentioned taller spring perches, I'm partial to TNT's U-Bolt Eliminators(UBEs). Using all three methods could even net you between 3"-5" of lift(.5"-1.5" from UBEs, 1"-2" from shackles, about 1.5" from shackle relocation brackets), allowing you to use a much flatter leaf spring, giving you a better ride and more flex.