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Just buy a new one, many manufacturers, M & H, Lectric Limited, American Autowire, etc. I like to buy from Eagle Wire although there are many distributors and retailers.
Many who are supporting vendors on this forum such as Keen Parts, Corvette Central.
The only way to "restore" an old harness is to replace everything which deteriorates: Wire, which is likely to have broken strands and cracked insulation, connectors which become brittle and shatter, terminals which corrode.....
After you do all that, you've got a new harness anyway.
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.