Weather is getting nicer, so getting the urge to start working on the door hinges of my '57 3100, but could use some advice/ guidance.

It looks like the lower hinge pocket has rusted through from what I can see, is this something that should be/ can be fixed prior to replacing the hinge pins? If so, what is the process, parts from where, cost, etc? Right now my driver door seems to drop a bit after opening, so thinking maybe the pocket is what is causing the problem??? Thanks guys.