I'm far from being an expert on tuning carbs. However, I've ran both the 750 Edelbrock Performer and the 3310, 750 Holley on my 383. They're like night and day. I tuned on both of them. The Edelbrock seemed to run just fine. Later I switched to the Holley. Had a slight stumble. Tuned on it until it ran really good. My ole 383 runs much stronger with the Holley. I'll take the 750 3310 Holley any day over the 750 Edelbrock Performer.