advise on title swap U.S to Canada

I've brought a few back in the last year but all with titles, I would suggest you have your bill of sale notorized before you bring it across. You can get a temporary tag in every state but make sure you bring your insurance slip or no tag! To prevent getting challenged on the sale price bring the currency conversion slip from the bank if you pay by cash or a copy of the check or bank draft. If you can document what you paid there will be no problem with Canada Customs. Ogdensburg/Prescott border is good, Ivy Lea near Kingston is also good. You do need to decide which crossing you are going to use and call them about their requirements. For example at Lewisburg you can fax them a copy, Ivy Lea requires the original documents be sent in advance. Each crossing have there own standards.
Good Luck,
Don