Primer and prep question

[thebebop]

Ok, I finished the truck several months ago but one thing that kept bugging me was the 57 hood on my 55 truck. I looked for quite some time for an original 55 hood in decent shape locally but could never find one so I broke down and ordered a re-pop online.

This hood has the black "epoxy" primer on it from the maker. I've never dealt with this type of stuff before so here are my questions.

1) Can I just scuff the black primer and apply color? If so what grit paper should be used?

2) I am using 2 stage paint...Urethane. If you think I need to apply primer over the black stuff before the color will lacquer primer work or do I need to go with something else? I ask because I have a gallon of it already.