There is engine paint primer from rustoleum to go with their top coat engine paint. I personally use primer anytime I paint on an unfinished surface.
Having said that, I wouldn't burn that paint off unless you're just dying to paint it. It probably won't come off with just smoking. We just built one here a few weeks ago and the factory black paint is still perfect after an initial run up of heat to 400 degrees by accident when he did his fatty break-in.