Bob,
One of my 61's is black, I didn't do anything different from the white car. I'm not a painter but I paint my own cars in my garage. I do have a HVLP gun to cut down on the fog in the shop. I always figured that if I put enough paint on the car and my sand paper and elbow don't give out, I can make it look like I want it to look!!! I never use clear coat unless it's a metalic color, you've about got to use it then. I for sure would not use clear on black because I think it puts a haze on the black causing a milky appearence instead of the gleaming black finish that you want. I use PPG Deltron or Concept, I don't know if they make Deltron anymore. This brings up another problem for the backyard guy, I only paint a car about every 3 or 4 years, with all the changes going on in the paint industry, it's about impossible to keep up with what works best. My best friend owns a parts store and is a dealer for PPG paints, my son-in-law in a paint rep for Martin-Senior so they help by keeping me up to date on the changes. But here's what I do, first, make sure that the thing is ready to paint, then put about 5 wet coats on, let it set for a week or so and then start sanding.
I start with 1500 grit paper on a soft rubber pad, then go to a 2000 grit on the rubber pad. I flood the area with water all the time that I'm sanding and listen closely for any sound of grit under the sand paper. Then buff with a rubber pad and Meguiar's #4, then buff with a rubber pad and Meguiar's #1 and then use a rubber pad that Meguiars sells called a woolless wonder and Meguiars #3. I don't use a wool pad, only rubber. I then hand polish the car with a polish that I get from Ausleys Chevelle parts called Show Car Glaze.
I usually figure 2 weeks or more for the sanding, that's working about 3 hours each night and more on weekends. In other words, this ain't a body shop way of doing things, you couldn't make a lot of money painting cars like this.
I'm not saying that the above method is the best or correct, it's just the way I do it. I'm sure other members have other ways of reaching the same goal.
Will say this, I usually go through about $75 worth of wet or dry paper per car.
Good luck,