Remember the thread here a couple years back where someone very reputable laid the story on us of his long gone '67 L72 B-Body...GM factory demo maybe?.
The thread included pics of a tag he'd saved that was an additional tag (perhaps inner fender mounted) that had 'Special' or something to that effect on it?.
There's been a few other '67 L72 B-Body reports that sounded to be possible truths over the years but this was the one I had the most faith in..
~ Pete