I've always liked the Grand Prix as well, and a few years ago there was a 69 just a few doors down the street from me. It was parked in a carport for several months when I got a chance to talk to the owner. He was maybe 21 or 22 years old and didn't know much about cars, but he said that the engine had lost oil pressure and he didn't have any tools or knowledge to fix it. He was considering selling it because he needed a reliable vehicle for a daily driver but I didn't have the room or the cash at the time. Car had a 428 and turbo 400, very solid body, interior was pretty rough. I still see it around here in the summer months.
I had a 76 Cutlass Supreme that was a fun car, same platform as the GP.