I can tell you from experience that 8" of lift ain't cheap. First of all, at full droop your tie rod ends will be deformed and possibly ruined, unsafely ruined. You will need some sort of high steer of other aftermarket steering. Most don't do well on the highway. Second, the stock driveline will not take the angle. You will need a slip yoke eliminator and CV driveline. And don't forget those shocks. Also 3' spacer blocks are not a real good idea on a XJ