I have been reading some previous post about lowering the rear to get the geometry correct.I run a 87 gn clone with 8.5 10 bolt,all iron bbc 454 11.7@123 mph best 60ft 1.72 my front end has the v6 springs but the rear end is very jacked up about shouls i lower the rear some??And how do i know how much to lower the rear.Ther front has a 2 inch drop due to the weight of the bbc,i have some weight reduction in the front,fiber hood,steel front bumper with aluminum enforcement cutout/removed aluminum bumper shocks,no ac,ps,heater,aluminum iroc-z raditor aluminnum intake,manual brakes,aluminum batteries,90/10 front shocks ce.,aluminum calipers.