personally camwise I like to stay with around .480 lift -using the mopar purple shaft cam. been a long time but they sound great- run awesome. valve reliefs in the pistons would be required-with the composite -thicker head gaskets the valves just touched the pistons, -my bad. consider the thicker head gaskets. I put one (.509 lift) in my '69 Cuda 440 (factory) with headers, tunnel ram .holley 660 carbs and 4.30 gears it was an 11 second car at 118 mph. right up to the time I blew the begeesus out of it. yes- I ruined a perfectly good 440 factory cuda fastback, but in 1970 it was only $1600.00