What Phil said about bracing. Your best approach would be to hang the doors back on and align them with proper gaps front, back, and top (or beltline matched), then install some bracing to hold that position. It'll be much harder to do, but, like Phil said, if you get it wrong, depending on the floor patch panel for location, you'll be up a creek when it comes to refitting the doors. If there's a Factory Assembly Manual for your year, you MAY be able to use weld checking dimensions from that, but the original doors would be a better approach.
Please take a step back and do some bracing.
Good Luck.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
