What's the correct way to Prep and paint my 69 slanty.

remove rust, clean with "wax and grease' remover, or pure d enatured alcohol. the factory just shot them with single stage enamel. along with overspray on things like exhaust manifolds that were already attached to the engine prior to paint. any type of paint will eventually burn of the exh manifolds I figure. maybe some of the guys with the big budgets have found something??
seems it is hard to find a spray can paint that has enough solids to compete with spraying real paint. and high temp paint?.. not sure there really is such a thing. just so the can tells ya that!