Rear wheel and tire combo ???

I'm not sure of the wheel well differences between '69 and '70 so take your chances. 69_340_GTS- Not sure if you have a typo. Mine were 255/60-15. ChichliDart-I posted a link to my original setup. My fronts were 14". Rocky-The 255s had about 1/2-3/4" clearance with everything stock. I have clearance pics if needed. http://www.forabodiesonly.com/mopar/showpost.php?p=1970477246&postcount=496
Sorry, I misread. The biggest tire I can get on the back (or front) of my '69 Dart with basically stock suspension (just Super Stock springs in back) is a 225/60-15. I have no idea how some people (like you) fit bigger tires than that on them without modifying something.