Help finding a 1 barrel carb, or converting to super 6

The BBS is a good replacement (and upgrade) for a 1920. However, the carb you linked us for an early A, with a rotating rod to operate the throttle. Your Cuda likely has a cable for the throttle operation. That will need sorting out one way or another.

A Super Six is an excellent choice and better than any one barrel. I have a number of two barrel carbs if you need one, shoot me a PM if interested.

Is you car a stick or auto? If auto you will need the correct kickdown parts or an aftermarket replacement.