The model prior to the B is the AA used on 1949 and 1950 Oldsmobile. 2 barrel downdraft with horizontal air intake (and a gear driven accelerator pump!).
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
