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I used Mar Hyde's Black Satin finish on my '70 and it came out excellent. This was the paint that was suggested in a couple of Corvette project books for 68-72 C3's (I think one was by Pfanstiehl...spelling may be off???). Anyway, not sure if it would be different for your '80 though. You can see pictures of how my interior turned out by clicking on the link in my sig.
I did my '78 ash tray lid and I was told to use semi-flat, it was a wrong match for my console. I changed it to gloss and it was perfect. Different years might have a different look.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.