I am currently running a Racer Brown STH-42. 254@ .050..and .520 lift. 300 duration...Hydraulic.......Pulling 11.60's with stock rockers, 9.5 Dynamic converter...in 71 Cuda...850 holley, 6 pack anchor pistons, and SD intake..3 inch exhuast....Ported my own heads to 260-270 flow on 906's..(intake flow) 430 gear........Wondering if 533 is worth a test....