Another vote for Tower Paint. When I restored the engine bay of my 1969 340 Dart Swinger, Tower made up three rattle cans of R4 Bright Red paint for me.
I thoroughly cleaned the engine bay (with the engine out), then shot the engine bay and inner fenders/firewall, followed by clear after a couple days. Turned out excellent!
BTW is your car GY8 Gold Leaf Metallic? That's my 1971 Duster 340 exterior.