69 Nova window track

[Schonyenko2]

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If my memory is any good, the glass is held into the channel with some friction tape - pressed fit. The windows are unique, but can be rolled all the down. There is a special guide on the front track in order to do this. Putting them back up can be a challenge, and one should usually use two hands to do so.

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It is a special type of friction tape. It's still available and will work but care, and patience are needed. Most used is blk urathane. The same stuff used to install frt, and back glass.
It's not a hard top. Leave em up.
Back in "older times" when Chevelles, and Camaros (hard tops) were popular everyday drivers, people would sometimes get in the back seat of Novas after having consumed way more beer than needed. Rolled down that qtr window, and wrapped their hand around that B pillar before realizing that when the guy in frt shut the door, it was going to be on your hand.
Ask me how I know.