I've had some with really nice gaps and others that were really bad. Luck of the draw. Start at the back and work forward. If your chasing nice gaps on any older ford or whatever car for that matter it needs to happen prior to paint. As Ando said rubbers fitted and door hinges bushed to eliminate droop. Really nice gaps will require levering, smacking them with mallets and hammers, or adding metal by welding or grinding edges back and rewelding to suit. If you aren't that keen its a happy medium I'm afraid. One that really shits me is the dog leg to back door. I don't think I've had one yet that doesn't have a way to tight gap.