Alright, time for an update. I Unexpectedly had a few hours to work on the car today, couple of buddies came over to help with the floor too. I don't know what sort of adhesive they used in the 60's, but it's stubborn as hell. We spent hours scraping, sanding, and grinding, and got the rear half of the interior cleaned up and ready for paint:
There's only two spots on the rear floors that need attention - one 8"x8" section that I need to cut out and replace, and another small area that just needs some patching. I'm VERY surprised that there's not more rust (knock on wood).
It was killing me to do all of that work and not see what the new paint would look like, so I de-greased a small section in the back and laid down four coats of "Rustoleum Automotive Enamel". If you ever use this stuff, DO IT OUTSIDE. This is not spray paint, this is death in a can. Holy crap. I'll be doing the rest of the painting outside for sure.
That's all for now, next step is to finish off the floors, patch the bad spots, and finish painting the interior. Then it's off to the wheel wells and suspension.