shock lenth for torsion lift?

[zdawg8394]

i am planning on doing the torsion lift to my 06 h2, instead of using the truxxx or any kind of kit im going to order the torsion keys from gm. and im planning on using new shocks, what size will i need? and will this give me enough in the front to level if i put a spacer in the back ( 1 inch)