Carb upgrade on 65 dart 2bbl 273

65Vert, which Edelbrock manifold do you plan on using? Do you want manual or electric choke? Something no more than 600 CFM, by Holley(0-1850S) or Edelbrock (1405) would be a good starting point. These are manual choke carbs. They are also squarebore flange. So if you are using Edelbrock manifold #2176, which is suggested as a stock replacement, then you will need a 4 hole adapter from squarebore to spreadbore. T340