Duster window help

So I'm in the middle of trying to get my 73 Duster back on the road, and right now I'm having a hell of a time with the windshield. My problem is that I've had a glass company install new glass and 2 different types of gaskets. After letting them bake in the sun for a week or so, they still leak in the same places, in both upper and lower corners. Now the last time another guy was out here I had him remove the window so we could try a new gasket, and this time he claims that my window channel looks damaged and won't bother with a new gasket until I get it fixed. I'm including some pics of my channel because I don't think it looks damaged but I wanted some professional opinions. Now the black stuff you see is por-15 that I painted around the edge a while ago just to help seal up some bare metal. Also could I see some of your guy's window channels just so I can show him that there's nothing wrong with mine? Thanks