i repowered my old 31 bertram with these engines,5 seasons,notta problem !!...installing a cut off switch for the compressor is a good idea,if the noise is getting to you
be sure and use volvo coolant on those engines and use distilled water only-reason being,the cheaper grades of antifreeze have a huge anount of silicates,these will actually bond to the tubes in the heat exchanger,causing an insulation,end result...engine runs warm...
it's a good idea to pull the injectors and "pop test" them after a few seasons...
make sure you got that boat propped correctly too...that engine should spin 3,900 on the pin...you wanna see that number...