Took the Dart out today for a drive

And you're not tubbed or springs moved in ? Could never fit anything near that on any of my Darts , 68 , 70 , 72 ,and a 74 , wow , largest tire I could fit was 245 /60/ 15 .
No it is mini tubbed with narrowed 9" parallel Alston Prostreet 4-link with panhard bar.