Windshield under gasket seam

[Bomp]

1965 GMC cab. 2 Questions 1 advise.
Question 1 is about the circled area in the last pic.
Any idea on what the "puddy like" material is in the black circle? The "puddy like" material was under 90% of the gasket around the windshield. The "puddy like" material was also globed in the gapped area under the windshield rubber seal to help prevent leakage.
Question 2, "filler material" (not a gasket) under the removable hump in the floor.
Question 3?. Any advise on what to do about the gap at the top of the cab? 4th pic.
Patina builds are becoming the hardest to conquer.

Thanks for any help.