well, it's taken a long time for me to find a Buick worthy to purchase, but it's finally happened! I've been messing around with old muscle cars since my freshman year in high school, and I'm really excited to get this baby home. Now I just have to figure out how to get it home from Ottawa Canada!
Congratulations! And welcome from Western Canada! All I can suggest is that you contact the US border services as well as the Canadian border services and see what documentation is required. I don't think the Canadians care much about a car leaving the country, but the American side will. For US requirements, you are going to have to prove title, something Canadians don't really pay attention to. The easier route would be to hire a brokerage firm, they'll be able to pull all the documents you need together for you.