68" a-body panel alignment from the factory?

Hi!

Last july I bought really rusty 68" Dodge dart 2d post and I have done massive sheetmetal work with it. Finally all the welding is done and I have been aligning body panels and door gaps.
The thing that I have been wondering is that how straight these cars were from the factory line? Because for example driver side door fitment is pain in the *** :). When I manage to get the door upper body line in its place, the lower part of the door is sticking out. I have tried to hammer it down, but the inner door structure is quite solid and it is not easy to modify.
So many body panels have needed cutting and welding to get them fit properly and even gaps.

Funny thing is that all the time so many people are saying that their car has completely straight sheetmetal work and no filler....