one point to make is there are no aftermarket carb conversions with a provision for carb heat!
depending on where you are it can make it undriveable in damp cool weather.
ALSO a  very common  reason for carb conversions is bad compression in a cylinder!fuel injection will not run ok but a carb will!
also I don't think anybody makes a distributor that has the proper curve for a vangon. You need a vacuum advance to pull enough advance at low rpms to give low speed drivability.
bad move unless cheap.
mike