If you must pursue this project, I'd suggest trying a Rochester Quadrajet; famous for smaller-than-normal primary throttle bores and larger secondary throttles - progressively open according to air flow needs.
The small primaries should ensure higher air velocity which should help atomize the fuel along the longish corridor to each valve.
Let us know if the resultant throttle response meets your requirements.
Get it out of your system or you'll never be satisfied until you know first hand.
Some QJ info:
Rochester Quadrajet Tech Info - The Carburetor Doctor
Sherwood