Importing a car from Canada

so I'm on the search of a very rare car and I have a couple leads in Canada.

But that brings to mind, what is the paperwork process to getting a car over the border into Montana and getting the papers transferred to Colorado.

Anyone with a similar experience??
@oldkimmer
Montana is the border that George (gdrill) used for his transactions.
He would be the one to talk to.
So, are you thinking of buying the Canadian '71 340 Swinger column auto orange with scoops Crosstown Edmonton car from Red Deer, Alberta?
P.M. me is you want more info on the car and the guy who owns it.
Caveat Emptor is all I can say.