46 Chevy Trucks,
From your pictures it looks like your windshield is glued shut with sealant. Does your your windshield open with the regulator? If not, you won't see the bumpers, which are in the window channel, at the bottom, about 4-5 inches from the middle. If you open your windshield, you will also notice that in the bottom corners there are drain holes. These go into the space behind the kick panels inside the cab. Originally, there are rubber tubes that connect with the drain holes and the rubber tubes go out the bottom of the cab. Otherwise you get water on your floorboard. The drain holes and tubes can get plugged with dirt and debris.
Kent