Without mini-tubbing your not going to be able to fit a wheel wider than 10" or a tire wider than a 275 and thats just the rear. Up front with a stock subframe I dont suggest running a wheel wider than a 9.5. It is possible to get a 275/40 up front but you will need to cut portions of your inner wheel well out.
Also, dont assume backspacing is the same on all vette wheels. They change from year to year, and model(standard versus Z06, etc)
I have a link that I use and will try and post that converts offset to backspacing and another link that tells you what offsets certain vette wheels are per year and model of car.
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Gaetano Cosentino
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