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looking to put 335 tires under stock wheel wells on an 80
That's not happening.
You can get 285s on 10s with some effort but the closest thing to a sure fit is a 18x9.5 with a 5" backspace and a 275/40 tire. Just keep in mind when a tire/wheel combo is too big on a Corvette if you're lucky it rubs. If you're not you wind up with a broken fender. Not Good. Not cheap.