OK, You asked....
If I were doing my car, I'd use the following on both windshield and backlite:
Adhesive: Essex brand U-400HV (High Viscosity). You'll need two tubes to install both pieces.
Primer: Essex brand U-413 on the pinch-weld and U401 & U402 prep and glass primer.
Butyl: Adco/Titan brand RT-0105 Square tape You'll need two rolls to install both pieces.
I'd clean cut out all the old crud - right down to the pinch-weld. Get it as smooth as possible and then coat it with the U-413. Let it dry for a few while I prepared the glass with U401 followed by the U402. The primers come with cotton applicator daubers. (Its critical the glass surface is cleaned with alcohol free cleaner so the primers can etch the glass.)
Once all is cleaned and prepped, I'd lay a "dam" around the very edge of the windshield opening using the butyl. The reason I'd do this is twofold. 1: It looks like the original install and 2: It will keep the urethane (adhesive) from oozing into the interior. (Note: before the next step, try dry setting the shield. Lay the butyl down and check your height. Do not press down too hard as you may distort the butyl and make the shield difficult to remove.)
I'd apply the bead of urethane to the pinch-weld - some folks swear by applying it to the glass first, but if you're not experienced in installing, I'd apply it to the pinch-weld. Get a friend and carefully lower the glass into the opening. If you have large suction cups – use them. Try to touch down evenly. Once down, firmly press into place.
Finally, do not drive the car for 12 hours (for safety reasons as the urethane has not cured) Also, keep your windows rolled down as I’ve seen way to many leaks caused by car doors being slammed shut with the windows rolled up. The air pressure forces the glass out.
That’s it! Remember, this is my opinion of how I’d do it. I’m sure there will be someone who thinks their way is better…
PS: Most any brand will fit the hole, but I'd use LOF glass – the OE supplier for the first generation Camaro’s.