Grand Spauding Dodge?

Back in the late 60.s( giving a way my OLD AGE)-Grand SPauding Dodge out of Chicago sold cars similar to Yenko,s Motion Chev,they would have a full page AD showing parking lot full of these cars ,,one of those models was a Dart-Valiant sedan with 440. and such,my freind had a 67 RT,HE WANTED one of thee so BAD .In all my veiwing of Barrett Jackson,Mecum and others I have never seen any of these cars-I just wonder were they all ended up,the chevys sure are out there???
Bill