Re: 1987 four winns sundowner 195
OMC put the full power package together. They got the block from GM then added the stuff to adapt for use in a boat. They then put their Cobra outdrive on it.
A nice boat with an obsolete power package. The 4.3L engine is basically the same as the one used today by Volvo and Mercruiser. That isn't the problem. It is the OMC specific stuff that may present challenges. The "batwing" exhaust manifolds are one thing that are hard to source.
The entire outdrive portion of the package, while a good design, is often misunderstood and no longer easy to get service or parts for.
If you really like the boat and know of a service tech willing and able to work on the outdrive, I would throw the guy a low offer on the premise that the drive package is obsolete. It could turn out to be a great boat for you. When it comes time to do major service work it may be a great platform for a repower.