how to get back window out??

I believe the 67 had a plastic type push in around the windshield, and they were prone to cracking. A lot of folks upgrade to the 68-69 style. As for the chrome trim on the 67, I really don't remember. I had a 68 coupe back in the late 70's and I THINK it had the chrome trim, but I'm not 100% certain. Old Timers disease. :) I'm sure some of the folks with 67 Cudas can answer that question for you.
As for replacement gaskets for the rear window, I think Layson's and Year One both have them. There's also a place in Saskatchewan that has them but I'll have to see if I can find the name and tel. number for you.