I am not sure what system they used in 1968. Pretty sure the choice was either acrylic lacquer or acrylic enamel. The color is the color but the system is how it is applied. Today's high performance paint systems weren't available then. Base coat/clear coat, urethane, water based, epoxy primer, none of these existed back then. So you can get the color in almost any system you want. Application is dependent on equipment and skill level. What a professional shop would use and what you can use in your driveway are two different worlds. Then you have to worry about compatibility. Some paints can be used over the original with no problems. Others are death to each other. Some shops will insist on removing all the original paint and starting from scratch with modern paint. But you said you were good at paint so I assume you know all this. I have a friend with an auto body supply shop. He blends me up whatever color I need. But I suck at paint so I can only use enamel or base coat/clear coat. I re-did my Rally II wheels with enamel in the correct Charcoal Grey and Argent Silver. I painted my Trans Am with what he called 'Fleet White' enamel with a separate hardener/gloss additive. It turned out pretty good but the additive used isocyanate which is very toxic and dangerous to inhale. Modern paint is nothing like it used to be. But check this out: I was searching for the color and even Sherwin-Williams uses it for interior house paint. Aleutian Blue