Lost Mountain was out in the country back then. But which theater on the square. There was the big one at the corner (later an off brand church when I was through there a decade or so ago - it was the Strand back in the day) and a much smaller, crummier one toward the middle of the block closer to the Dunaway’s drug store. (Cobb Theater, maybe. Google indicates my brain is still working.) I don’t think I was ever in the Strand. I was in the small one once for a friend’s birthday.
I’m pretty sure it was the strand. It was right on the square on the NE corner (if I remember my bearings)