If you feel that youre really getting jipped after talking with us then renegotiate. Tell him the truth... Be like, "Look, I did some research and talking with some friends who are familiar with Datsuns. With the condition its in and the parts that are on it I only feel comfortable offering [insert value here]" I say something like $1200-$1500 is fair. If he doesnt like it, then deal a bit if you feel youre getting you moneys worth. He may say no thanks. Then just politely tell him that if it hasnt sold give you a call because youll be interested. Just dont give him whatever he wants because you really like the truck. Ive been there and its doesnt end well.