Performer RPM/383 question

Welcome to the dark side. We also have ice cream!

IMO. The RPM intake is a great choice. 750 CFM's is a good Size carb for a 383, stock or well modified. To use a DP carb with a auto trans car, the at should be able to handle a W.O.T. which may require a decent rear ratio and more than average converter. They. An be a little hard to dial in otherwise.