the problem nowadays isn't getting it INTO Canada, it's getting any complete old vehicle OUT of the US - they want the paperwork in their hands 3 days prior to arriving at the border for exporting, and you have to be there right at the time they tell ya or you hafta go back and wait for another appointment - not sure how they treat untitled things now cuz they want to check if the vehicle is stolen
you would be best to phone US customs at the border crossing you would use and inquire - Canada customs will just want to collect the GST is all, they could care less otherwise, titleing is up to your province
Bill