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Now you all got me curious so I went and checked mine. The gasket is glued to the body but not the glass. It has held well and not leaked for close to 20 years. I am very careful to not get into terrain that torques  the body.
When we replaced glass on my 1978 years ago it took 3 of us most of a day to get it right. I ordered that glass from Newell. We could not get the glass to set centered in the gasket until we actually trimmed a bit out of the opening. Keep in mind that on the old classics the body around the windshield was aluminum.

Thanks for your input. That is what I was thinking of doing, glue to body and let the glass float on the inside of the rubber. I think I was having more issues with the body twisting as my HWH system was not working properly and I think this has made things worse. Now that I hope I have it all working properly I believe we will be good to go. I did not want to replace the windshield until I knew I had the leveling issue fixed.