New carb for a 273...

Thanks for all of the info guys, appreciate it. I plan on keeping this car #'s matching since it's somewhat rare to begin with, but still want to add more power to the engine it has. Plan on rebuilding it to D-Dart specs in the future (a few years, once I learn a bit more). I thought the stock carb on the Commando was a Carter AFB 600, could be way off...
By the way, this site is awesome!!!