Progressive 2bbl
I went from a BBD on a factory super six setup to a Weber 32/36 DGEV?, anyway it had an electric choke. This was in my 74 Dart with the engine and accesories from a 79 Aspen. Gas mileage was a bit better. The key thing is to learn at what point the second barrel opens on the 32/36. It is not vacuum operated, it is mechanical. There are factors to consider when tuning such as rear gearing, adjusting the kickdown, jetting, etc. Also, I got rid of all of the emissions crapola. But the Weber is VERY easy to tune. One more thing, if you go with the Weber, you will need to swap over to a cable operated kickdown and get a longer throttle cable. And do some minor modification to link it all up. The levers on the Weber are not on the same side as the BBD.
Brian