I would love to be limited by drivability rather than by economics from getting my hand on a Can-Am car. Good for you!
i have a '60s lotus 23, which was built for Le Mans, and it was very low six figures. but an engine rebuild is $30k...
Trackdays skew towards much more modern cars. Although I met the shop that takes care of my stuff at one (they did Spec Miata rental, and now I race that too)