I don't know about Hot Wheels, but I found resin models of a '68 4-door and a '67 2-door (they're calling it a '68, but it has '67 grille and no side marker lights) on eBay. Kinda pricey but definitely neat. Here's the link:
No, no Valiants from Hot Wheels. They've done fastback and notchback '68 Barracudas (the fastback is pretty clearly a BO29, looking at the hood scoop), though.
I don't know about Hot Wheels, but I found resin models of a '68 4-door and a '67 2-door (they're calling it a '68, but it has '67 grille and no side marker lights) on eBay. Kinda pricey but definitely neat. Here's the link: