Carb and Divorced Choke issue

It has trouble warming up and has a very rough idle while I am in drive, but stopped. As this car is new to me, I am learning as I go. In inspecting the individual components I came across that piece and saw that it was badly rusted. While trying to research what this piece actually was I came across an article that said to replace it immediately if part is rusted/corroded. That sent me into a whirlwind trying to figure out which carb i have so I can get the right part.

In talking to my father, who owned the car before me, he informed me that this car has a Super Six. In researching Super Six packages I found they either came with a 2 barrel. Carter BBD or a Holley 2280.