Acrylic Enamel vs Acrylic Urethane

Car was already painted when I got it. The engine bay did not get painted. The engine bay is bone stock (dirty) with all original stickers etc. I want to paint it to match the exterior of the car while I'm swapping the /6 for a 340. It doesn't need to be perfect show quality but at least decent.

When I'm finished with my other projects the Dart will get a proper paint job. With my luck that will be 15 years from now.