I actually bought a top end kit from a fellow racer at our track that consisted of the Comp roller cam, Comp roller lifters, Comp pushrods, Comp Magnum roller rockers, & nicely ported Edelbrock Performer RPM heads that have Ferrea 11/32" valves, matching Comp springs, titanium retainers, and flow 287 I and 212 E @ .650 lift. I also have a new Super Vic to top it off. The guy I bought the stuff from had an identical 410" short block that I am building and dynoed @ 594 HP. He ran it in an all steel 71 Cuda with 6.60 1/8th mile times. I saw it many times. He has since went with a W9 top end and is running in the 6 teens.