Original owner says car came with polyglass tires.

[camarojoe]

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Correction, the tires that the original owner left the dealership on in June of 1969 say "Goodyear wide tread GT" and have NO size on them so they would be correct for the car in 1969 at least according to the Mustang guys.

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This I believe. Goodyear Wide Treads are not polyglas tires. BTW, the original size on a Camaro would have been E70-15, not F70-15. A Yenko Chevelle would have had F70-15 Wide Treads, so there IS the chance they could have been swapped from a Chevelle.