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If your not pinging, and your sure, then you don't need higher octane fuel. Higher octane fuel will actually produce LESS horsepower than lower octane fuel because it burns slower.

The intake is an Edelbrock and the carbs were for a Corvette. I can't remember the #'s off the top of my head, but I will go out and look tomorrow when the light is better. The real Mr. Norm's Demons did not run the same fuel lines as the 70 Six pack engine, the fuel went into the carbs on the...

I haven't had mine long enough to monkey with it, but it runs good, has an idle like a 2 bbl should and kicks in hard. It does need some tuning, and the carbs are due for a rebuild and tune so maybe I'll have an different opinion afterwards.

Those are cool. What are you planning to use them on?

Yes it makes an engine run hot...can't explain it but I once burnt my fingers on a wing nut of a friends 383 that was running WAY too lean.