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I would also recommend Team One Chevrolet/GMC used to be an Olds dealer. They do my insurance work on my daily drivers and did the paint and body work on my supreme. And my buddys 1972 Grand Prix which has won best paint twice in different shows.
Your blue is very close to my code 25 Astro blue. And bare in mind that the body and paint is over 20 years old in this picture!
Southern Polyurethanes is the place for primers, reducers, clearcoat, black single stage, and support. They are in Georgia but have free shipping. I've been using them for 10 years and they have the best quality materials with good pricing.
Color can to come from a Finishmaster, Ridge and Kramer, or Painters supply. I'd want Standox or top of the line PPG base if you can. They don't always have the old formulas so they probably will push Nason or some other cheaper line due to pigment availability. For some reason Dupont(Axalta) has dropped some of the old pigements used in old formulas. They offer them in Nason though. I've purchased samples from Nason, did a sprayout and then get it converted to Standox. A lot of dinking around to get paint sometimes.