to the guys that know everything about dart swingers...
Nice looking swinger!
Post a pic of the rear end from the backside and we can tell you what it is.
Wheels and tires are a pain on a Swinger for sure, but from looking at the pics, Im pretty sure yours has had the rear wheelhouses enlarged pretty substantially. Looks like they did a nice job too.
Here's a pic of my '71
See how the fenderwell is "squared" off and doesn't go above that crease in the sheetmetal? Pretty darn sure a '72 is the same.
So that's kind of cool. I bet that thing can get some huge tires on it compared to the typical Dart.