I have a nbs z71 that I took the block out and put a 2inch lower shackle on. I want to relocate the shocks and not sure of which ones to get. What length do I need now and which adj one's. Truck will be street/strip.

 

You'll have to measure for your own specific length, the shock I recommend is a QA1 single adjustable but I have seen a lot of people run the rancho adjustable shock with good luck.

 

I would go viking all the way. I run double adjustable. 150% better ride quality. As far as measurements when u relocate go from center to center bolt hole. The passenger side is a lil longer FYI in stock location.