There is a problem, though, and that's that the engine can completely change the nature of the car.
The Challenger is small enough that putting the big block Mopar engines in the nose, the B/RB series and Hemi, drastically changes the handling over, say, the 360-6. In the Challenger, (Rather than the larger Charger, which doesn't care what mill it has) The car becomes much more nose-heavy, more of a dragstrip monster than a handler, which, with the 360 smallblock, it can become.
Now, with different tires and suspension components, you can turn a big-block Challenger into a vehicle which will run circles around an SRT-8 without adding power. But you could do the same with a smallblock Challenger. Modification changes the character of a car further, so we'll leave it out.