Casey there was a 78 in Toledo area when I was driving my 78 Cutlass , around 85. I liked the look of that one also. My cousin had a 78 pontiac at the time, the only reason i noticed.
I think the 59 was done for a prototype (one of 2 if I remember correctly) and used for a parts runner at the Pontiac plant until it slipped out the back door. A story was in a Hemmings mag a few years ago. I sure hope it was not an April issue. LOL