1/10th scale RC Kyosho Fazer 1970 Dodge Charger and Hellcat Challenger

Chrysler jammed a 426 Hemi into an A-body in 1968, and you can't put a Challenger body on a different RC Car??
Really?
That's not the representation in the hobby that we're looking for....

At the very least, put a Hemi in that Camaro. They make scale Hemi's, don't they?
I’m getting the sense that you may be misunderstanding what these things are. These are 1/24 scale model cars so 7” long or so? Of course someone could invest the time to 3-D print their own body mounts alter the chassis length, and go to some lengths to modify them to accept bodies made for other chassis formats. Honestly, I’d rather spend the effort working on my 1:1 scale car.

As for putting a hemi engine in a Camaro, these models are all powered by the same 130 sized brushed electric motor. if you’re talking about a dummy engine for scale appearance, that would be cool but again, more trouble than it’s worth to me…

…especially since I LIKE Camaros! :D