I don't think I'd want to go any lower than 2000 at 65mph. Any lower and I think you risk just lugging the engine when you hit a hill or a strong headwind. But it also depends a lot on your cam, compression and the rest of the combo. IMO if you get it between 2000-2300 at 65 you will be doing just fine.
Quote: My friend said if I am cruising the car at 2000 2200 I will still be using the idle feed in the carb.
Your thermoquad will be off the idle speed circuit before that rpm.
