I'm hoping fbodfather reads this thread...... GM's attorneys would probably like to speak to this dealership. In person. With cease and decist court orders in hand.
Since "Z28" is a registered trademark of GM and Chevrolet, it is illegal for anyone to make a profit by selling anything labeled, advertised, or passed on as such whether expressed or implied as a "Z28" if it is not a Z28 as made by GM.
The same exact laws apply here as someone pirating music, and then selling it to make a profit.
If this dealer makes a profit larger than what would reasonably be expected by selling this SS as if it were an SS and nothing more or different, that is illegal.