In my opinion I think the Goodyear Wide Treads are correct for your car. From everything I have seen it seems the later build 1969 Z28's had the Firestone Sports Car 200's. I have never known of a 1969 Z28 coming from the factory with Firestone a Wide Ovals. Just my 2 cents. I have Goodyear Wide Treads on my 69 Z28 and drive the car a few hundred miles every year without an issue. If your alignment is set for bias ply tires you should be fine. Can't beat the look of the bias ply tire on an original first gen.
Scott
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