I'm not seeing Chevy and Ford pulling out, personally. Not this early, anyway. But if, and that's a big IF, Mopar was granted the use of something that doesn't reflect a current combination, as well as parts not being available to everybody, then I don't want to hear sh!t out of the Mopar camp about this weight.
If you meant similar to what you can get in a street version, I'm confused. Only the Fords use a variant of a road-going block and by the time it's assembled into a full engine it's nothing like the street use Coyote. Last I heard, you can't walk into a Chevy dealer and order a Camaro for the street with a 427 or Supercharged 350 (Although I bet some wish they could!). Likewise, you can't order a street Challenger with a 426 or the drag pak's Supercharged 354.
EDIT: But I guess you can get a base 4 cylinder Camaro and buy the copo engine yourself and swap it.