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In 69 the cars were no longer "converted", right? They came as COPOs at that point. And I guess that is why were there cars "left over" that sold after the 69 model year?
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This wasn't exclusive to '69...the majority of the '68 Yenko Camaros started as COPO cars (suspension, speedo, carb), but not all of those cars got converted to 427 power. Brian Henderson (BKH) was probably the first to put that puzzle together...