It's been 10+ years ago but I recall having the same issue.
'76 T/A...First style Hurst weatherstrips by Metro Molding...too long in that area.
If I recall correctly, I measured carefully and cut out the "extra" with a razor blade and glued them pieces back together with 3M weatherstripping adhesive...also put a thin coating over the outside edge of the seam.
It held fine and looked no less sloppy than original GM
