Ok guys...I know I have been DRAGGING this topic around for a few weeks but I just did some measuring tonight and want to see what you guys think.
Ive been running 15"x8" rim with 4.5 back space with 5/16" spacer on the driver side and 7/16" on the pass side. Tonight I put them both on the pass side to see where the tire would sit. I now have atleast 1/2" maybe even 5/8" between the bulge of the QTP and the leaf. With the SS springs,the car sits high enough and I have plenty of room on the outside.

My question is this....I want to get a 10" rim but what back space??