One crazy theory that came from my questioning mind.
Since the letter “Z” was used, would there be any reason that it could correlate with the “Z” model designation for Mustang. Also I think Brian Styles theory might be more right than wrong as far as Ford’s increased involvement at this period in time in late April 1967.
Wild idea, but could it be Ford claiming as their inventory rather than Shelby American’s...marking them as their internal “Z” code for Mustangs?
I will admit I do watch a fair amount of conspiracy theory based TV shows🤙🏻, so it could merely be my overactive imagination. Doesn’t seem out of the realm of possibilities to me.
Jon