67 barracuda vent wing?

as said there is a clasp with a phillips (middle circle) maybe loose if not you can remove the clasp and and reduce it's arch a tiny bit to add pressure on the vent windows center pin.
It may require pulling the glass/vent assembly out as a unit to properly remove the screw if rusted or stuck. not that tough a job just have another to help so you do not scratch the paint etc.

if the vent frame is loose against the A-pillar the two outer circles are where additional adjustments can be found they normally have plastic body caps covering the bolt/ nut. Slight adjustments can be made there.