Rear window is bonded in, I generally use 5/16" or 3/8" ribbion/tape to install the rear, best to have both tapes on hand when doing the job, so as to set the glass height properly, front windshield is a gasket, as I'm sure you know, generally it's best to use a new repro/NOS gasket, also when installing the windshield on a 2nd gen B body, it's best to add about 12" of sealant (NO SILICONE) along the drivers and passengers corner, and 12" of sealant from the bottom of each corner up the A pillar windshield opening BEFORE you install the windshield gasket, only add the sealant and gasket when your ready to install the windshield, if an installer tells you you don't need the sealer in the 2 lower corners, you'll have leaks later, the reason you can't find an installer, is most new "techs" don't know how to install an older gasket lock install, plus they don't want to risk breaking the glass trying to fit it in the gasket channel, it is tricky for most novice, I'd recommend a professional installer if you've never attempted it before, assist the installer and learn for the next time...when you call around for an installer, ask them for someone experienced in antique/classic car glass and explain what type of car/gasket install system you have, most of the big chain autoglass companies have/retain individuals experienced in antique/classic cars
Mike