Looking for any help. I have a 1976 Grady with a 302 engine and based on the tag attached to the outdrive its an omc model #981095 serial #W96595 .just bought the boat and second time I took it out on the water it made a pop and doesn't go in gear. Long story short does anyone know if this lower unit can be swapped out with anything newer that you can still get parts for ? Say mercruiser ? Thanks for any help