I had a 78 SS that I changed it in car. You need to know how to time the injection pump(might as well change the belt because your there), and get the nut off the crank( I put the car in 4th and parking brake) which can be a knuckle buster. While tapping in the new one, try to keep it even going in. If there is a deep grove in the pully shank it might leak still.