Carter – 7504S, 7504SA 927S – Carter always has a ‘S’ at the end.
Carter B&B Ball & Ball – D6H1
Ford – C034 AN – note: the 2nd digit is always a number.
Holley – R 1234 1A, or R 1234 1, or R 1234 – The R may not be included on the stamped carb number.
Zenith – 12345, 12345D