I am not a painter so I can't tell you how many coats to apply. That is up to your painter. If he does not know, then you need to find another painter.
One person cannot not do every task of a restoration by himself, that is why it's best to leave things like paint up to a professional. I'm in the process of getting my new "Project Stocker" '67 Z28 painted right now and we've had no problems matching the original color........or how the job will be done. It will be base coat clear coat with single stage on the white stripes. If any of you have more questions or issues regarding these things, you need to attend the ACA Camaro Nationals in Carlisle, PA. This is where the best of the best are in the country and you can see everything up close and personal. You can also talk with national event judges and get the correct answers for any issues that you have.
Regarding the finish, you can leave it textured a little if you do not wet sand the car totally flat. Doing this will give you a GM factory painted look. All of this depends on how much the car is wet sanded after it's painted,