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305 is about 12 inches in the rear. 1920/21 x 12" is some serious tread. I'd say it's very possible. The vipers run 335s and they have 13" wide wheels (last time I checked).
I don't know much about Zeta platform, but I would venture that Chevy probably has done it's homework. I don't think they'd put something on the car that is less cost efficient unless it was more performance efficient.
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