Does it have to be a performance car? A luxury land yacht would make for some nice cruising.
I had my grandfather's 76 Buick Electra 225 limited ( 2 door) and although it wouldn't set any speed records, it was one of the nicest riding vehicles I ever had. It's like having a steering wheel on your lazyboy recliner
Previous to that he had a '69 Electra 225 that moved pretty good. iirc, that had a 425 in it