Never Built ???
However, comma. There are a number of cars from that era "that were never built!" but actually were, because someone knew someone who could alter the line ticket, do a "special" for a management type, etc.
There's all kind of old magazine articles about such cars, although I grant you I've seen more about GM stuff than Mopar or Ford.
I know of a 'Vette that belonged to Zora Duntov with a year or two ahead engine than available for that model year because "The Man" wanted to drive it for a while. It was built on the line, not in the prototype shop, etc. The guy who had it some years ago has just been letting it sit in his garage up to the point I heard about thru a mutual friend. And yes, he had seen the car up close and personal.
I worked at Buick in Flint in the mid '60's and I could write books about what I saw and even helped do that would flabbergast most folks. For instance, I saw a little 3 on the tree Special shipped with the small V8 instead of 6 (vs line ticket) just to help make the day's "shipped" numbers better. Justification? "Hells bells, the guy is getting more than he paid for!" I was told. Hmm, yup, just another satisfied customer!
So, never say never just because it doesn't match the printed source material. A lot of changes got implemented at the 11th hour right as the first cars were being built. Last year's knobs, emblems, floor mats, etc were often used if the supplier was late with the right color, style, etc.
Enuff from me - just needed to stir the pot amongst the authorities.
Sorry, I'll behave in the future.
RC