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285/30-19 will be within 0.2% of your stock speedo readings. A quick TireRack check reveals that this size also comes in most of the popular high-performance tires.
Well in that case ... either 275/35-18 or 285/35-18 both work. 285's are 0.7% off, 285's are 0.4% off in the other direction. Both sizes are commonly manufactured.
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.