I think so. Same as a Chevelle in those years. My son's 70 Chevelle is full frame. GM used the changable front frame sections on the Camaros and Novas and the like....
Neighbors kid was building a GM vert a few years ago (he has his own place now so his cars aren't there anymore). I think similar. Had frame off. He had a second frame, but didn't have re-enforcements for vert.