Welcome to the Ford Barn ! I currently have four restored Holley 4000 carbs in the swap Meet section here. 3 with the correct part number for auto trans, and one for a manual trans. '56 292 or 312.
They all work on either transmission. The same calibration. Only difference is the auto trans. carbs have a dashpot.
All fully guaranteed to look great, work great, and no leaks. I can send pictures if you give me an email address.