What RPM do I need to run the brat at when cold and when warm to keep the foul problem away? Other suggestions to keep the plugs burning clean? - I am using NGK BP7ES

Edit: I only use Chevron super or Super without ethanol.

I have a 3.0 in my GT with Weber 40's and a 3.0 in my SC with PMO 46's and neither one fouls plugs. I have used Bosch and NGK both worked fine. Has your ignition distributor been recurved for carburetors ? Both of my cars are cold blooded but clear up within 20-30 seconds after firing up.

Had the same prob, MSD unit fixed it right up! Bob

you definitely have something else causing the problem

any smoking or oil useage?
compression up to stock numbers?
it could also be a jetting issue... what idles are you using and what main chokes?

you might be able to mask the problem with a heat range change in your plugs (if its an oil blowby problem)