My E-body has Calvert's mono-leaf springs and the older 5-way adjustable Rancho shocks. The car weighs 3750#s w/ driver and 60-fts in the 1.45-1.46 range on 275/60R15 MT ET Street Radials.

Going by leaky memory (I don't have my notes on hand) I started w/ the 1/2 turn preload L&R that Calvert suggested, then only needed to increase preload on the right side 1/3 turn (also, as suggested by Calvert) to keep car from pulling to right slightly when coming off the line.

I don't launch any higher than about 2000 RPM from the foot brake to avoid pre-loading the chassis, either.