In my experience, Canadian cars that require those parts, have alot more rust hidden in seams and other not easily accessible places so you may only have identified a portion of the repairs required. So is it worth repairing, the questions that come to mind to decide on this are, Does the car have sentimental attachments? Do you really like undertaking this much work? Is there something special about this car, eg. Z-28 or an SS? Otherwise a search for southern metal is the preferred route. I have seen nice project cars in North Carolina, very reasonably priced. As well, there are Canadian "locator" companies that will find what you want and bring it to your doorstep.
You should check out the Canadian Old Autos magazine, these types of services are found there.