Finally installed windshield

What we did, and what I am describing, is the instructions taken from pages 7-3 and 7-4 of the Factory Service Manual for a '74 Dart Sport. This is what we did to Aaron's Dart Sport, and it hasn't leaked a drop in over three years.
As you can see in the last one of the first series of pics above, there was absolutely no sealant under the gasket along the cowl. A carefully controlled water test indicated that was the area that had the leak. There was no rust-through along the window channel, so I have to assume it was seeping up under the gasket and finding its way in behind the dash.