Horsepower

Dose anybody know how mush horsepower would I make with a 454 big block chevy It has a cam shaft made by compcam. I'ts a extrem energy 552 lift intake and 555 exhoust. it also has an edelbrock performer rpm air gap intake, a holley 850 cfm double pumper. headmen headers. duel pipe with flowmaster 50 series mufflers. I also had the stock cast iron heads ported. the duel pipes wil be 3 inches or what do you guys recomend. I have been asking local performance shops about witch carb to use and they all say 750 cfm. they say a 850 is to mush for the street.