Your in NY, so Dupont Centari is still available in your State (that's where I purchase my Centari from) acrylic enamel code EV2 (HEMI-ORANGE), have the paint mixer delete the metallic paste during the mix, add the gloss hardner as well as enamel reducer when spraying, your technique will determine how much gloss/sheen you want on the engine, I prefer a "wet/gloss" look rather than a dry finish...

Your choice whether you prime the engine or not prior to painting, I use an acid etchant primer prior to painting, never had an issue with paint lifting/peeling/etc/etc, cleanliness and preparation are your friends

Mike