One other idea...if it says Motorcraft, where does it say that? Lately on eBay I've seen a rash of "frankencarburetors" being sold by a couple of different sellers. They are all Carters, but the air horns and bowls are totally mixed up. You should avoid these completely. Take a look:
https://tinyurl.com/y8run522 This is no more a 3211s than it is a bowling ball. The 3211s had an automatic choke which was cast into the air horn and could not be removed. Look at the final image and you can see the air horn does not match the float bowl at all...there is an open space at the top where gas will slosh out at every turn. Search for 3211s and you'll see another person trying to sell one which has been cobbled together from assorted parts.
