Spread-bore intake: second Jerry's comment about a Q-Jet above OR Carter TQ.
Square-bore intake: Carter AFB 3721s (3721sa, 3721sb).

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop