I have a 99 jeep xj classic,and I hade someone put 3" blocks in the back, and coil boosters in the front,but it stills sits higher in the back,is there any cheap solutions to add to add to the coil springs to make it an even lift

 

You can go to the junkyard and grab a few stock coil spring isolaters. They are the same for the xj as they are for the zj. Each one gives you 5/8" lift and they are stackable. Good Luck

 

x2 or shorter blocks in the back to make it level

 

Blocks increase axle wrap and generally suck poo-poo.

I'd ditch the blocks and use a combination of bastard leaf pack (GM S-10/15) and 1-2" lift shackles.