Normal on many olders. That said ,2005 GTO customer car I recently remotored, was incredibly stiff . Lifting a corner, lifted entire side. Ya, both doors worked without bind too.On my recently acquired '66 pro street car, we've adjusted both doors by moving the frame-mounted strikers and a small bit of shimming on one hinge (driver's side). When the car is on the ground, both doors close nicely. But if I have the car on my lift, the driver's door is way out of alignment, while the other door still closes fine.
What's going on? Could there be a frame problem, perhaps something loose or broken, that lets the left side of the car move?
I could just ignore it, but if there's a frame problem, I ought to find and fix it.