Hello all, I'm about to get my '67 GTO fired up, looking to put a new carb on my Edelbrock 2156 manifold. The Pontiac 400 has the stock "670" heads, 068 "S" Crane blueprint cam, HEI ignition, headers, TH400 with a 2200 stall & 3.36:1 gears. Not sure, as the carb selector says 4175 series spread-bore Part# 0-80555C, or if I need a 750 CFM. Prefer single inlet. I plan on using the car on weekends, and as a daily driver during the warm months. Any thoughts appreciated.