73 dodge dart swinger wheel and tire size?

Hey everyone new here and this is my first post.....i have been searching but am going crazy trying to find the info i need......HELP!
I have a 73 Dart Swinger factory 7 1/4 rear end setup! springs in factory location and no mini tubes.......Of course i want the BIGGEST wheel tire combo for the rear i can get, i know i am limited but want the wheel well full!

I would like to know

1.) wheel size

2.) Back spacing needed

3.) max tire size

and if anyone has pix of their set up!
thanks in advance for your help
I love this place! lol

Bruce