Mike - I Have never seen one of the 747s. Too lazy to search the microfilm for a print. GUESSING, since the 235 truck engines in the late 1940's used the passenger carb, that the 747s was the same.

Carter DID make a type W-2 carburetor with the large throttle body. Good luck on finding one!

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