Big rear tires on 70-73 Swingers! What fits?

I don't have pics but I test fit a 27560R15 on my brother's '71 Dart with SS springs in the factory location. Never drove the car with them on so I don't know whether they would rub in corners. Had about 1/2"-3/4" clearance on both sides of the tire. He eventually went with a 25560R15. No rubbing during cornering.