The car will be quicker w/ more air pressure and tightening up the rear shocks. I'd try around 17 psi to start and go up from there. I run 20 psi, but you may not need that much.
My car always ran good w/ the rear shocks set on 9, full stiff (Rancho 9 ways). I use the bottom hole w/ no preload.
What front shock is on the car???????
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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