I know I'm getting Bilstein 5100. What I don't know is the length. I don't want to lift the rear any. It's a z71 burb. I am going to order eBay keys to level the front out. Should I add those jounce things too? I imagine I'll need 1.5 minimum in the front to level it. Also when if at all should coil springs be replaced? I was planning to go with the atomic coil over kit but I can put that $600 extra toward a 6.0 swap next spring.