Should I buy it? 1963 Chrysler Imperial

Imperials until '67 are body-on-frame cars. They aren't c-bodies, they are something else. Some parts are hard to find and expensive. People say the 413's gas mileage is a bit better than the 440. Keep in mind you have to like really BIG cars if you're going to daily-drive it. Personally I love them but wouldn't be the most practical for parking.