Whats a nice sized tire for a fastback Cuda

Hey Gang
I'm thinking about going to a larger rear tire on my 67 fastback. I don't want something crazy just something that looks good and fills in the wells better. I like the look of the factory 68 hemi cudas before they were altered by racers. Does anybody have a clue what size those were. Even better I would love to see some pictures of what people are running on there fastbacks!!!!