Also if he knows it's going to a good home he might be more inclined to sell it to you.
Write him a nice letter telling him about your passion for the car and how much it would mean to you to own it. That way he gets sometihing out of selling the car. He'd be helping you achieve a dream and life long goal. I know someone who was able to buy a house out here in L.A. (Passadina actually) that way.