I pulled my engine for a shady tree rebuild and you know what? You might as well http://home.maine.rr.com/lanesrus/car.htm
while the engine is out. (current progress at top). I used high temp aluminum paint on the heads and then Dupli-Color on top. Has held up Ok on the exhaust ports. At least when the blue burns off the aluminum underneath is still somewhat shiney - instead of rusty iron. I used Rustoleum satin black on everything but the radiator - which I used high temp gloss black. What a difference when it was done though!