And don't fudge the purchase price to save on any fees/duties/taxes.
Nothing on earth is worse than a bad case of Homeland Insecurity. Not even the Spanish Inquisition has more power and less compassion than a Customs Agent. Makes the IRS look like the tooth fairy.
When I brought the 2002 in from WA, there was an American tourist that lied to the Canadian Customs about how much alcohol he had for his weekend trip. They tore his SUV apart, seized the booze, fined him many times the value of the contraband, kicked him out of the country and put a don't come back order on his file. All of this in front of his three children and wife. Apparently they do the same going the other way but you get a trip to Cuba (Gitmo) as an incentive to be truthful.
All they asked of me was to pop the hood so they could see what a carburator looked like.