I'm aware of the Balboa(-X), have the factory brochure, and contributed a scan of this photo:
https://packardinfo.com/xoops/html/modules/myalbum/photo.php?lid=94 Though there haven't been a lot of details published about this concept car, I'm big fan. It's another one I wish PMCC would have built.
Still, I'm thinking there was a second Monte Carlo concept car, but could be confused.
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