318 carburater

Actually, the super six carb is a great little carb. Perfect for a stock to very mild 225. Subtle differences from the 318 version are the key, the pump cam has a different profile smaller venturis, Teflon coated shafts. http://www.imperialclub.com/Repair/Lit/Films/348/.
If you have a genuine super six carb, that's the one i would use.