Mike,
Funny you ask... We definitely got poured on yesterday in FW. And unfortunately, I realized that my windows are not sealing well to the upper window seals. I don't blame the seal, I think they are actually GM pieces (I did not replace them during this build), but instead the adjustment of the window itself. At the top of the closing, the glass is kicking in too far and too high at the front, which is causing the back to not seal as well as it should. I need to pull the door panel and adjust it again...
I haven't heard very good things about the reproduction seals either unfortunately which is one reason I didn't pull these. They aren't in great shape, but they should still seal ok given their condition.
I replaced the glass on the car during the build, and I think I ended up with Pilkington pieces if I recall correctly. I'm actually on the hunt for a new windshield now, mine has a crack and needs to be replaced.
I'll try to get one ordered this week, but they aren't cheap by the time you include shipping...