Nytrainer, I once got in a restored 67 GTO to do some fixes on, and the owner supplied (DBC) base coat to do some engine bolt head touch ups. The car only had a few hundred miles on it since the engine was painted, but heat had yellowed the clear coat so bad everywhere that the touch up was way off.
I use activated Omni single stage over epoxy in most cases.
The last picture is a 68 400. The discoloration at the ports is to be expected with any engine paint.
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