How do you adjust the vent window frame

"67-"69 are a little different than previous ones. The "A" frame is secured in four places. The front of the main frame is secured by one bolt and one nut (which is also an adjustment) in the front door jam area. The adjustment here "tilts" the "A" frame to mate with the front weatherstrip. There is also a screw behind a rubber plug just below the vent window that must be loosened during adjusting and will secure the assembly in the adjusted position. Then there is a bolt securing the bottom of the track on the bottom of the door (may have a rubber plug over it) which not only holds the assembly in place but is responsible for adjusting the "in and out" tilt of the top of the "A" frame. There is little adjustment to go "up and down" with the whole assembly. If the door is properly adjusted, then the weatherstrip (in your case, the top) needs to be shimmed to match. The door glass has its own "up" stop that can be adjusted independently.