Tires or Alignment

Put the rears on the fronts and see if it still pulls. If so, you need an alignment and probably front end work. If the tire went to the belt on the inside edge, which is typical, my money is on worn balljoints and a trashed LCA bushing. This is a very common failure mode on Mopar front ends. An alignment shop will be able to help you identify the worn components.

BTW you likely have 195/75-14 tires on your Dart. Only the early A's had 13" rims and 185/80-13 is a more typical size. Either tire is super common (cheap) but you should get the front end repaired before wasting money on tires.