I would caution you against going too low. I did and the shocks were incorrect for the set up, they bottomed out first. Make sure your suspension can cycle cleanly and double check your driveline angles.
Dave
Dave, I'm having the same issue, what shocks are you using. I have QA1 adjustables, but they bottom out.
A-body spindles, Cordoba 11.75" disks, boxed LCAs, poly bushings, 1 1/8" sway bar, .96 Tbars, QA1 single adjustable shocks, stock rear springs and sway bar, 65 C body 8.75 with 3.73 SG, Dr Diff spring relocate mounts. 17x8 with 4.5 BS 255/45/17, 18x9 with 6.5 BS 285/40/18 BFG KDWs
I didn't take the shock sizes into consideration when I ordered them.... expensive mistake.