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I don't think it would hurt the value at all since you are talking about a non-numbers matching to begin with. I think most people will prefer it more with a manual tranny. Besides, I'm a firm believer in doing what makes you happy with the car rather than worrying about what other people like and worrying too much about values. Buy it to enjoy it!
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.