Max tire diameter on a 72 Dart.

I'm trying to figure out what wheel/tire combo I'm going to get for my Dart. I'm going for more of a pro touring look so I would like to keep a low pretty flat stance and some wheels that fill the rear wheel cutout well. I was wondering what the maximum diameter tire you can put on a 72 Dart. It looks like the biggest thing limiting the size is just in front of the tire at the bottom of the cutout.

If I were at home I would just run out and throw a wheel on the car and measure off that but since I'm 660 miles away I'm going to the forums.

Thanks for the help.