140 mph is about the time front end lift begins to raise its ugly head with a stock Pantera. If that is going to be in your normal spirited driving routine, a spoiler should be on your purchase list.
I like this one from Dennis Q made of ABS plastic and much more forgiving than his fiberglass version. Nonetheless, damage happens and they only seem to last me 5 to 7 years. This was during installation and there is still some protective masking tape in place
your windshield trim is likely not an easily corrected problem. 🙁
The trim has a small J hook at the very bottom that indexes into the rubber gasket. Proper installation is to install gasket to glass, carefully and firmly install chrome trim and then install as a unit. Once the unit is installed the tension on the rubber gasket will usually prevent resetting loose trim such as yours. It may push down but getting it to actually latch the J hook is difficult
I would lubricate with a spray tube silicone can and then cross your fingers, attempting to reset - at the same time - from both outer ends of the problem area
Good luck
Larry