This link will explain the numbers that should be on the tag that would have originally been on your carburetor (assuming your carburetor is original):

http://www.thecarburetorshop.com/CarterChevroletW1.htm

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