FWIW to this thread it's the 11 challenger that starts getting the 6.4 in srt trim. They are advertising 470 hp but that is a joke. The 6.4 in crate form is rated at 540. Supposedly they tuned it it to make better average power, rather than hit a high number. The 6.4 is going to respond very well to mods. The car is still a tank, but they are a hell of a nice car. I'd rather have to make the challenger quicker than make the camaro equal the looks and comfort of the challenger.
But for a drag car, you'd be hard pressed to beat a g body for the money.