I have a 73 351C that is being rebuilt. The rebuilder is using a mild performance cam (duration aprox 270 ex & int; lift aprox 500), crane gold race roller rockers, KB Pistons; all new upgraded hardware, the crank will be balanced; the heads are open chamber 4 BBL (the compression ratio will probably be about 10:1 with the new pistons); the carb is a Holley street avenger 670 CFM dual feed; Edelbrock performer manifold and headers. Would anyone be able to estimate the HP on this motor? Thanks very much.