I ended up 'raising' the doors into the door opening on my 55.Took alot of work in the hinge area. Ended up with a pretty good gap all around..added weld bead as RJ mentioned, then finally got it to the point where the "inside" of the door actually hit the dash...decided to relieve the area with a cut-off tool ,hammer and re-weld.
Yes there is some major "gap-osis" on these old trucks, take your time with each concern...it will pay off in the end.