Actually I believe the real car just had a flat roof, mine was not intended to be vinyl, however as I painted the other colors, I never covered the top so it had a few layers of "over spray" which gave it a little texture, but the actual paint is Testors flat black from a spray can. This may sound crazy and I can't "prove" this technique, but when I want a smoother finish from a black or red spray can I use the nozzle from a silver spray can.....it seems to flow different. The other colors were Testors enamel put on with an air brush including the clear. Nothing special on the roof number, Power Slide decals worked great.
Thanks for the comments
MG