Drivers Door: Video inside.

Door is dropping as it opens. Most likely need the hinges rebuilt. Everything is complicated by the welded striker. Gaps mean almost nothing on these cars. The uneven gap could be how it came from the factory.

You could try a couple free things. Put a floor jack under the rear of the door. Loosen all the hinge bolts to the body on the bottom hinge, loosen all but one hinge to body bolt on the top hinge. Jack up the rear of the door, re tighten the bolts. You are trying to get the latch to match the striker correctly. You may need to play with which hinge you pivot off of (which one you keep a tight bolt on).

This should at least get the door working right.