74 duster pulls to the left, then centers, HELP!

I thought it was my steering box at first, so i changed that out. I have muscled around my ball joints and my control arm, they are barely worn but in a lot better shape then some i have driven. I also made sure none of my brakes sticking, and my wheel bearings... although i am running crappy mud/snow tires in the front, with a set of ancient Concorde trac-action 60's i found in a garage in the back.