A $40,000 restoration of a 1947 Chevrolet five window truck will be worth about $25,000 - $30,000 in most markets and the same goes for the restoration of a 1949 Chevrolet five window truck. Although the 1947 is unique, most people don't know the subtle differences to make a value assessment IMHO

Do with it as you please unless it is so original that it could be considered a low mileage survivor that you don't have the heart to modify it.