I've run a few .509s, i wanted the sound of that cam, but the 1st. thing i did was raise the compression with some decent FTs, either KB237s or TRW 2255s, my 1 dart i installed a TM7 & 850dp., had 3.91s, Cheapie 4500 stall, MP dizzy, MSD box, drop the cam dot to dot on all of them, had the int. timing around 16-17*, total was 38* & light springs, they all ran great, always had to run MTs, street tires never had a chance. Those cams do like compression/timing & stall.