lokking for tire recommendations for 1975 dart swinger

I have 14x6 Magnum 500's on the front with 225/70R14 T/A's and 15x7 magnum 500's on the back with 255/60R15 Radial T/A's no rub issues but it is about the limit without tubbing/relocation-at least on my 73 Dart and yeh I know that Magnums weren't stock in that year (for all the purists....)