1973 340 Duster Carb question

I want to be able to drive it not race it. What size carb should I be looking at? Any recommendations on model/brand? Any help would be appreciated. I am guessing the gears are upwards of 4's, but have not investigated this as of yet, but I know they are high. I will eventually bring them down to 3's w/overdrive Passon perhaps.
IMO
Pull that engine and sell it.
Install 3.23s
Go to the pickapart and grab a 318/904 or 5.2/A500
Forget the Passon.