RE: Challenger in NASCAR
That car only looks like they put a Challenger nose on the front of the "everycar". The Challenger inset grill and headlights would be a aerodynamic nightmare for a NASCAR series. That was the whole reason Ford made the special Talledega Torinos and why there were the pointed nosed and big winged SuperBees in the late 60s early 70s before NASCAR outlawed them. Even the 05 to 09 Mustang front end is a brick compared to the cars run in NASCAR.
But yeah, I sure would love to see new Mustangs, Camaros and Challengers (not necessarily in that order) running together on some road coarses again.