my car is 3550 lbs runs a 9 inch 3.89 gears and 26/10 /15 mt home made caltracs split mono leaf rancho 9000 shocks , 904 auto and 4800 stall full manual 408 cub ,indy heads ft cam solid 950 carbie 11.1 comp and some nos it ran pb 6.3@108 l good for nines and when it ran 10.3 it was 6.59 @105 the 1/8 the last pb are with mufflers on run 10.90 no gas with mufflers