So...what's up with the Belvedere ? I can see the engine's the wrong shade of orange, the Valiant hub caps, and a couple other details...

I'm more of a Belvedere guy than a convertible guy, not that it matters.
I'd guess the GTX could hit $140,000 or thereabouts at auction.
The Belvedere might do $70-80,000 - maybe more, depending on a few things.
Folks at auctions generally don't seem as Mopar-savvy as I think they should be...