I assume you are going to sell it. Trucks are WAY easier to sell if put together for visual effects. That's what sells. Put the old motor in. Put the seats in. Put wheels and tires on it. Barn find style sale. Don't do too much more fixit work or you will screw it up for the antique purest.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn