Wife and I are first timers. We have had ski and pontoon boats but nothing larger. We are looking at a 1992 350 aft cabin. It appears to be in good shape and well maintained by the three owners. I understand the two questions below depend on lots of factors but just looking for some general information as a starting point. Two questions:

1- Hour meters on the two Mercruiser 454 engines show 930 hours. What is the useful life of these engines and what are the engine parts that will need attention or replacement within 5 years?

2- What is a reasonable annual allowance to budget for repairs and maintenance for all systems of the boat?

Thanks for any help offered.