67 Dart Convertible front window trim

I would wait until the windshield change to install new lockstrip. BUT that lockstrip acts as your sealer and helps to keep moisture from getting in.
Replacing glass/trim/gaskets can "domino".
Don't ever just toss an old gasket repops are not always the best solution.
Good luck
I will eventually replace the original front windshield because it has lots and lots of time spider web type scratches on the outside of it, and some on the inside. I really do not notice these scratches in daylight but it is really noticeable (bad) when driving at night with oncoming headlights. Since the bottom strip is plastic would it best to wait until I replace the windshield to put in the plastic trim strip. I would think that with it being plastic that it might break when replacing a windshield, but not sure.