I have a C5AF EF carb with a tag on it that says D 5G8. I gather the second stamping is a date code (1965-July-8) and the C5AF means Galaxie or Full-Size Ford, but I cannot find the EF reference in any of my books. Does anyone know what that means? The E of the EF has an X stamped over it, both on the tag and carb base. Any help is appreciated.