BBD is the 2bbl Carter.
Edelbrock bought the rights to make the Carter AFB (in the 80s?) and also make an AVS which I know nothing about. All I have messed with is the Carter AFB and the Edelbrock version...simple to rebuild.
I know you don't use amazon, but this is an example of the AFB:
Amazon.com: 1405 4 Barrel Carburetor Manual Choke Carb Compatible with Edelbrock Performer 600 CFM Carburetor 1405-600 Automotive Replacement, No EGR : Automotive
I would assume you can find the same thing on the 'bay. I am not finding any 4100 clones.
First Autolite 4100 that came up:
1961-1963 Ford Autolite 4100 Carburetor
here is a link to the summit carbs we mentioned:
Pardon Our Interruption
That might be a "forever carb." Way more $$$ than when I bought mine.