For 500 horse from a 429 you don't need the supercharger. What weight of car and what rear end gears are we talking here? Makes a lot of difference on the parts selected. IMO the best out of the box heads for a BBF or the Edelbrock Performer RPM heads with the matching intake. I run an AED 800 mechanical secondary Holley built for E-85 on the street. For drag racing we run a 1100 Dominator set up by a local carb guru with the John Kasse design SCJ heads and a custom ground Comp roller--does 500hp,505tq at the wheels!