I just put the Edelbrock 650 with electric choke on and all I can say is wow!!!! I just thought I had a powerful truck before. It woke the old 429 up big time. It already had a performer intake and headers. The Holley had stamped on it P80. What model is that. I don't know if it was too big or just worn out b/c it looked pretty old. If any of you are considering a carb with a similar setup as mine, do yourself a favor and put the Edelbrock on.