Probably longer than the 2.7 (got one sittin in the yard), which I still find amusing they put that tiny engine in the 300 boat.
I say get a challenger, if mpg isn't a concern. I'd like to have a challenger myself, but I have a hard time trading in my hybrid that has same power as an R/T but gets 35mpg instead of 23. If I could just put the challenger body over my frame......