v8 FC

ok guys i got my motor and i am happy but it needs some cleaning! i started with the intake manifold and there was some like calcium build up on it, so i cleaned it and nothing used some wire brush and nothing so i gave up and painted it black..lol, but what i wanted to know is, on the heads and on the block do you guys use primer on it or just the engine paint? the only reason why i am asking is because i was thinking that the engine paint is meant for high heat, but not sure if the primer can handle it let me know what you think!