Not Ranked
Ulwe,
I don't know much about the Idelbrock carbs as I have always used Hollys but there are guys here that are really good on them. You could contact Bill Emerson of Emerson Motorsports as that is what he uses an nearly every Cobra he builds. I am sure that Double Venom could also help you. sorry I can't be more help but it does sound like a float or air fuel mixture problem. I am not sure about the 5 pounds pressure as I run 7-9 pounds in my Hollys. Oops, almost forgot Mr. Fixit. I am sure he could probably give you some good ideas also.
Ron61
Ron Widener
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