Old School said:This site for 348-409 carbs.
http://www.348-409.com/part.html#CN
AFBs were made for many cars Pont Buick and some Chrysler cars.
The tops are made so they can be drilled for inlets on either side. 409 400 HP AFBs at fueled from the drivers side.. I don't have a clue why...
I just took and Edlebrock Performer which was made from an AFB casting and made it into a driver's side inlet so to fit the stock fuel plumbing.