Wow. What a find. My Dad used to have a '59 Cadillac. He took it to Germany (Air Force), but it kinda went to pieces over there, so there it stayed. We came back, and he ended up with a '65 Cadillac. He sure liked those Caddies!
Your Dad had good taste! Caddies are fine cars. DW has a old broken down 02 Deville. Gets 25-27mpg on highway and 17-20 in town. Rides and handles great.