JW - Carter 437s was original equipment on a 1939 Hudson, and it is a W-1.

In the FWIW category, 137s was an experimental carb for a 1935 Hupmobile, that did not make production.

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