Ya, 3 guide blocks behind door trip top. Later years usually had felt on 2 of the 3, early used all. You can basically match the scrapes to where it's touching, and no, you can't polish glass to remove a scratch like that. There's also fuzzy guides on the front track just below where the mirrors mount, that tension the glass when fully up.
Depending on costs, you can replace the felt with your own stock or get a complete set of new blocks which have been available a few years now. These are basically the same as original so already know they won't last long term!
I had a write-up years ago with what I did but must have been pre-crash. Here's a few of the pics just for ideas. Back then there were none reproduced, and now that they are they aren't cheap either.
I had my original guide blocks replated, I bought some thicker felt from Germany and wrapped it right around on itself with contact glue. I'd tried even thicker in the past but had limited adjustment room. Shows the thickness compared to the repro felt that was available at the time for repairs, likely same as what is used in the new sets.
Window guide repro vs 3mm felt 2 by
Ben, on Flickr
Restored replated door glass guides felts 2 by
Ben, on Flickr
Restored replated door glass guides felts 1 18x3mm by
Ben, on Flickr
This is the extra-thick woollen felt wadding I tried first on the guide blocks above, it later came in handy for replacing the completely worn off fuzz of the window track tensioning guides. I did a post on these as well, gone also. These are originally riveted on, the glass just touches the point. So I did the same but used tiny bolts and locknuts that are clear of the glass. Until recently these tracks weren't available new again either, but again, they likely just have the fuzz that wears off easily. I also made the pads twice as wide for extra support, less vibrations. These are nearly all that support the glass when the window is up, other than bolted along the rail and limited pressure the door guides and seals provide when door is open.
Firebird replated window tracks with felt guides (2) by
Ben, on Flickr