Paint advice

I would recommend Dupont's Hot Rod Black. It is a single stage activated paint. I believe it will hold up much better than uncleared basecoat as it's designed to be used as a topcoat. I used it on the front bumper of my Shelby Dakota and like the look. It's part of the Hot Hues line of paint. Here's a link to Dupont's site;
http://pc.dupont.com/HotHues/deployedContent/en/us/html/images/prod_HHM-6400pg_ER3838.pdf#search='Dupont%20satin%20black%20hot%20rod%20black'
Don't use primer for a top coat, water will go thru it to the metal and it will rust.
Dallas
BTW, a Yahoo search will turn up several links to other boards where this paint is discussed.