I really like the look of the Challenger. I'd gotten a few as rentals here and there while I was travelling. I didn't like how it handled (V8's included) but I never did drive any of their "Sports" versions. Just base V6 and V8s. I'd hope that the SCAT Pack versions handle a bit better?
On your drivetrain setup, since it sounds like you're tearing it all down anyhow, consider a full weight billet steel flywheel since you're going through all the efforts for streetability. It [does] make a difference and your trans might even thank you.