Single stage or bc/cc for a vintage look?

Single stage. No need for bc/cc unless you are going metallic. The '69 Coronet R/T I painted a few weeks ago was done in single stage. Even then, you can still use single stage - I shot the fenders, grille shell and flames on my '36 with Nason factory pack single stage

Gary...Did you like the Nason and how did it lay down? I've used Nason for a few parts but, not an entire car. I've used the AkzoNobel/Sikkens U-tech 3.8 high solids and had very good luck with it. Its some tough stuff and the color is
very consistent. Just don't let it cure for too long if you have to fix something, I had to sand a few runs and it was a bear getting them out. Buffs real nice.