If he was in the UK I could help, but I know nothing about American Classics. Plus, rental cars aren't necessarily what a person would drive by choice; they tend to be staid and reliable. I managed to get the exception to that last year; I'd ordered a basic small hire car and got one a size bigger in the sports model for no extra cost. I kept the car for 2 days instead of the 1 I'd originally planned cos it was so much fun to drive!

If it was going to be mid-60s I'd say go for a mustang.