Not sure how much sidewall you plan to run or how low you're going but those cars look like they're pretty roomy so if you can fit an 18, I'd run it up front with an 18 or 19 in back like the current Corvette. A 17 without a lot of sidewall will have a lot of room around it in one of those.
I know that's not what you were asking but 18s and 19s will look a lot more proportionate and modern on there. Just look at current Corvette, Viper, Ferrari, Porsche diameters.
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