Will 275/60/14 rear fit on my 72' Dart?

Like Kevin and Dartboy said, they won't fit a Dart. Not to mention a 275 60 14 would be a bias ply tire and will have a wider tread than a radial, the largest 14" tire you can get in a radial is a 245 60 unless you go with Hoosier or one of the race tire companies. 245's are a tight fit on a Dart without the correct back spacing.