Sea Ray

Hello all I have a 1990 350DA with 7.4L Mercs and Hurst V drive trans' in tunnels.  I am the 3rd owner. The 2nd owner was very meticulous on maintenance and he claims the 1st owner was as well.  At this point, (knocking wood) everything, including original radar and auto pilot is still functional.  Engines have about 1600 hours on them and she will still get up on plane and run at as original spec levels for rpm, cruising speed with tabs and top speed @ proper WOT.  I live in the northeast with a short boating season which explains relatively low hours for the year (but will retire to Florida where I can boat year round in 10 years )

I keep her slipped at our boat club near Albany NY on the Mohawk River which is part of the NY State Canal system, and usually only go no more than 7 to 14 miles on a given weekend between 2 locks.   And a lot of time is spent rafting off at  anchor hanging out with friends listening to music eating drinking  swimming etc

Question is, I plan on taking a long trip this year through the canal which combines natural rivers and man made cuts to the Oswego river to Lake Ontario to my parents cottage.   It is about the 2 and a 1/2 day trip each way  And about 420 miles round trip.   

Although she's running good now, I was thinking of having compression tests or leak down tests done on both engines to make sure they are up to the challenge, and if so, besides plugs and fluid changes, replacing all the belts, hoses and risers as preventative maintenance before the trip to minimize the likelihood of things failing.

I know something else could still go wrong but I thought I would feel safer if I do all this.  Asking my friends a lot of them say if it's running good now why bother spending the money and I'm not satisfied with that answer because it would be worth it to me if it would make her more likely to handle such a trip. I thought I'd put this out there and ask the experts?