Tire suggestions for '74 Dart Swinger

The largest from the factory was a E70-14 which is close to a 205-70-14. If you want the same size front and rear the biggest I would go is a 215-70-14. I have 215-70-14s up front and 225-70-14s on the back. If I go to a 15 on the back I would go with a 225-70-15.