The Performer is stated by Edelbrock to make power from idle to about 5,500 rpm's, the Performer RPM from 1,500 to about 6,500. If I were doing it, using a stock converter and limiting the motor to 5,000 rpm's, there's no question that I'd choose a standard Performer. I'd want the higher mixture velocity afforded by the smaller runners of the standard model in order to pack the cylinders better at lower rpm's and give me more power under curve.