"1970 Pro Touring Dart Build"

Also wondering if there is a rear sway bar that will work since the car has been mini tubed.
The frame mounts on the sway bars I've seen look like it would interfere with the springs and the sway bar would make contact with the wheel.

A Hellwig E-Body sway bar works in the rear. It fits inside the frame rails so the minitub does not affect it at all and it sells for $175 through summit.
Check out this link:
http://www.forabodiesonly.com/mopar/showpost.php?p=1254264&postcount=95