Possible Dart Charger

The drivers side cut out looks original. I am adding a second cut out. One of the early drag racers ran the two resonators for looks.

This is an original resonator ( note Power Pack wording on factory box)

http://www.forabodiesonly.com/mopar/showthread.php?t=260852

Here is accurate resonator photo:

http://www.accurateltd.com/zoomify.asp?catalogid=195&img=assets/images/Hi-po system3.jpg