There is no way I would take a chance racing a V6 Mustang, let alone a 5.0 Mustang. I might beat or tie someone in a V6 with my Charger, but you never know what mods they may have done. There's a ton of aftermarket support for Mustangs, V6 or V8. And personally, Mustangs are pretty comfortable inside and the new 2015 Mustang's interior looks pretty damn good.
If I didn't need four doors, I would definitely be buying the new 2015 Mustang GT instead of the Charger I just bought.