I have a 454 4 bolt bored .030 over.bottom end is in excellent shape the block #361959.its hydraulic flat tap dont know numbers on cam but it is a comp cam.gold crane roller rockers.the heads are the rect. closed chamber ls6 heads from from 1970.gonna get heads recondition new seals, seats,valves cleaned up etc.#3964291 head #.3500 stall converter,3.73 12 bolt rearend,th400 auto tran.just wanted some input on a new cam i should go with.i want stronger power staying with hydraulic flat tap.i was thinking a performer rpm air gap intake and a 850 double pumper holley carb.i have a 750 double now but some guys are telling me a 850 double pumper will get more power.just wanted some hot rod input from you guys.its in a 1972 chevelle.the compression is 9.5to1.let me know what you think. thanks