How much is worth it all depends on you, our datsuns will never have the value that other old or collector cars do, but i guess the reasons why each one of us have one is in some cases priceless,i don't think there's a book or a rule to go by as far as dictating the price,of course the conditions of the car are the main thing,but other than that is all up to you: how bad do you want it, after all is your money: go ahead and satisfy your desire buy the car and enjoy the hell out of it,chances are you will spend that money one way or the other so follow your feelings.