Check this website of the registrar of imported vehicles it might have the information you need:
http://www.riv.ca/
Also there are seminars on many provinces on how to import a vehicle, you may find one close to you where you could attend:
http://www.cbsa-asfc.gc.ca/events-evenements/menu-eng.html
Remember even tho there was a way to import a vehicle permanently once inside (im sure there is one) you won't be able to import it if it first doesn't meet the eligibility requirements, here is the list:
http://www.tc.gc.ca/roadsafety/safevehicles/importation/usa/vafus/list/vafus.pdf.
I couldn't find any information on how to import the vehicle once inside, but I'd suggest you to call the RIV, this is their contact info:
Registrar of Imported Vehicles
405 The West Mall
Toronto ON M9C 5K7
1-888-848-8240
info@riv.ca
And this is the link where you can find another phone number thay might be useful:
http://www.riv.ca/english/html/contact_us.html
Another information i saw online was this:
For customs information about importing vehicles into Canada, contact the Canada Customs and Revenue Agency’s automated information service free of charge at 1-800-461-9999. You can also find information on the CCRA’s Web site at www.ccra.gc.ca.
I saw this at: http://www.canadiandriver.com/2003/09/15/feature-how-to-import-a-used-car.htm
GOOD LUCK AND PLEASE LET US KNOW HOW IT WENT.