Looks like a nice boat. 570 hours is low in my opinion. I have heard many opinions on how many hours you can get out of a marine engine. I say, just run them till they don't run anymore. With proper maintenance of course. I don't see why you cannot get 1500 hours out of a well maintained engine. Some people may laugh at that, but I have heard mechanics say they have seen engines with that many hours on them. If you are real serious about the boat then pay a mechanic to check out the out drives. Look at the oil within. That is the most important thing to look at to start.
Good luck my friend.
Good luck my friend.