if you cut the inside of the gasket in a nice big V shape at each screw across the top you could then use a 5/16" hex bit on 1/4" flex drive.

2 nuts/studs at colum & 2 bolts on each lower corner in the kick panel.

the dash rolls down from colum and out leaving the a/c heater box in place.

oh yea, for got the middle support brace that has a couple nuts that you can forget to remove.

best way to remove the windshield it to use a 10" butcher knife to lay flat on glass and cut the rubber gasket in 1/2 then remove glass.

I suggest new gasket and 50 bucks to a glass man for install.

clean & inspect the roof drip rail and pinch weld for gasket. repair as needed first.