I don't see it mentioned here but in the past the best paint I could find (close to original color when compared to parts painted originally in the 60's) was PlastiKote 226. I sold it back in the day and used lots of it on restorations and race engines without issue. And it covered in one coat - two max. The Direct Connection paint back in the 70's and 80's was garbage - it ran if you got any decent fuel on it. PlastiKote was the best back then - not sure today. Check it out. Another option back then was Rustoleum "Safety Orange" in brush on or in a rattle can. Also check out PlastiKote HP-15 High Temp Paint.