I have a '77 myself. 351 Windsor. It could cruise at 100+... felt like riding on a cloud.
I bought it for $500. The left rear quarter panel was smashed, and the vinyl had rotted (someone had replaced it by brushing on tar, about1/2" think... I kid you not). Swapped a radio and a set of tires for a paint job, grey on grey (instead of replacing the vinyl). Called it the Grey Ghost. Engine blew up on a frigid morning halfway home from work... oil pump had went out.
Man, I loved that car.