I second that, it is a 4100 4bbl carb. They were mage from the 50s thru the mid 70s. Originally Autolite, then Motorcraft/Ford. There is normally a Tag on top, but on the edge of the mounting base, close to one of the 4 mounting nuts, there will be a 3 or 4 or 5 digits stamped and in the left side cast there will be the original venturi diameter. If you can supply I may be able to correctly ID for you.