I am looking at your drivers side door and it looks like it could be jammed in (or could be).
Here is what I have had to do to a 71 dart years ago, I had to put a floor jack under the
front drivers side frame at the farthest area back (as close to the middle of the car as possible) I jacked it up and the door opened right up, the door hinges was worn and a bit out of line, when you open it you will see where the door was pinched in place. Remember these are una bodies and do not have a full frame, I hope this help's and your door opens right up for you