I've owed my Dart for almost 20 years. Worked on it off and on and this looks like the year for the Dart. A friend was over looking at it because he is going to do the bodywork on it. He noticed the door latch jam stud had welds around it that doesn't look factory. Both sides are the same. Is this common or did someone try to beef it up for drag racing?
Rust isn't the issue here. The door hinges wear, the door rides on and bounces on the latch post. The sheet metal cracks right at the washer diameter. Someone added scab layer of metal to yours.