The stock one. Your on your way to making a pig… the whole package has to be looked at… starting with use of car, street strip, or canyon carving, then Tire size, gearing, what transmission, converter if auto, car weight, and then motor size, what heads, and the other parts of the motor. As most of the guys on here know from experience, a bigger cam is not always better… your best bet is to call a few cams shops and see what they say. A custom ground from Howard’s was only 10 bucks more then their off the shelf, and about 50 bucks more than a summit cam. The cam
@lead69 picked for my Stock standard standard standard 75 318 in my Dart Sport Hang 10 project in front of a 904 was the Sum-K6900… oh yeah, using the stock valve train, springs, locks and retainers.
But suit your self