I am having trouble seating the weatherstripping on my 76 Z driver's door.

The gap on the upper rail (shown in the attached photo) is supposed to exist, correct?

A mechanic attempted to fix, but the door seal was too tight (trouble opening door).

I will likely buy a new door seal but I appreciate your advise.

Also the window has to be pushed the last 1/8 of an inch to close tightly. Any ideas rebuilding the crank mechanism, is there a replacement kit available?

Thank you.

No, that gap should not exist. The metal on that 1/4 window frame should be the same from top to bottom. It appears that someone has seperated the metal and bent it out in an attempt to close the gap in a leaky door seal.