Thank you Hotrod Lincoln, Carbking, and Panic for taking time to help. I have decided to keep the Holly 4 barrel 390, part #8007. Will do on the book and reading the instruction booklet but I do have a question. The instruction book and tech support at Holley both say that a minimum of 5 psi is required and 6 to 6.5 is recommended and not more than 7. I will follow up on your suggestions but shouldn't the first step be that of making sure the pressure to the Holley is according to spec? I thought I should make sure I am getting the recommended pressure to the carb and from there fine tune the carb to my application. I apologize for my ignorance on this subject. I have had my one-barrel for the last 45 years so this is all completely new territory for me.
