I am not a tire Guru
but the Goodyears fit perfectly on the rims. I know that when Rupp changed brand of tires on Penny a 255 in one tire was the same width as another brands 275. That was on an 18 rim and the aspect ratio remained the same.
You may want to compare tread and bulge widths between the brand of tires you want and the Goodyears that come stock on a Vette. They may be the same size.
I am diggin' your rims.
Have you test fit just the rims on the car without tires to check for clearance?
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