The rumor on the 63s is that Chrysler had a hard time getting some of them back. Seems reasonable. All but a couple were crushed by the bean counters. Bodies hand built by Ghia, imported on some sort of limited use waiver to avoid paying taxes and actually cheaper to cut up than keep. Hard to watch footage exists.

Oddly enough, youtube has a decent archive on the turbine program. Chrysler did a coast to coast road trip, stopping at a Dealer near you, in one of the 50s mules. There's a good vid on that. There's also a short one that mentions the mules from the 70s and oddly, a small fleet given to the EPA for evaluation. I say oddly because because part of the death of the turbine program was their "gasoline only" emissions test rule. There's a couple interesting ones about the world tour they took the 63 on.