As an addendum to the above post: The URL http://www.thecarburetorshop.com/CarterW1comparison.jpg is a picture of two Carter model W-1 part number 574S (1946 - 1948 Chevrolet). The one on the left was built by Carter in St. Louis, the one on the right was built by Chevrolet in Flint. Look close, and you can see the large letter "C" in the center of the end of the bowl on the carburetor on the right. I apologize for the quality of the picture. I have not yet mastered the digital camera with contrast in black.

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