help with 1964 chevelle hard top rear window

I have a few questions about the rear glass install. First I bought a repro rear window I have had to do a bunch of metal work when I set the glass in the frame I only have 1/4 of metal around the edge for the glue. The center of the glass sits about 1/4 off the frame of the roof and deck filler. I dont know if the car metal is off or the glass.
Thanks