Door gaps on old project cars are one of the most miserable things to deal with, and get "perfect". I have at times, when the gap was too large, welded a coat hanger wire to the door edge to fill the gap. I have taken my angle grinder with a 36 grit disc and ground away door edges---and if you grind thru the doorskin 'wrap around' then get out the mig and weld it back up. I have actually put a "port-a-power" into the door frames and "spread" them a bit to make a bit of gap when there wasn't one!!! Sometimes you can jam a peice of wooden plank into the door gap on the hinge side and force the door enough to bend the hinge a bit, but God help you if you bend it too much or the wrong way!!! One thing for certain, if you don't address it before the shiny paint goes on, then its not going to be addressed at all.--Brian