1987 V-170 outdrive leaking

I recently bought a 1987 Rinker V-170. It has a Mercruiser 300 Cubic in engine, and it is leaking from the outdrive. Is there a way to get parts drawing for that drive? I also am having issues with the throttle handle being loose and not easily shifted. Anyone have any ideas?? Where can I get parts?
Answers
By leaking from the outdrive, do you mean water is leaking in the boat or oil is leaking from the outdrive?