engine painting

I would use 500F "ceramic" engine spray paint. They have primers, though don't know if needed. I used Rust Destroyer as a primer on my 65 273 since it claims for both shiny and rusted metal and 800F. I haven't put enough time on the motor to know how it handles heat. Rustoleum rattle cans can spray vertically, which really helps if painting the engine in the car.