I am looking at a boat with twin Volvo Penta SX single prop outdrives, I want to make sure I am buying something that can be supported, previously had a King Cobra drive and getting parts was brutal althou not generally needed...

Questions:
are parts readily available?
I assume being Volvos they are pretty dependable?
are they rated for a specific HP? boat has twin 350s so I know this shouldn't be an issue

We have a Volvo Penta SX behind a 5.0 270hp and it runs well. Never had any issues with the drive. We have done bellows a couple times, and parts are always easy for the marina to get.