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Aloha Starfish,
Lots of black smoke after a long layup at 2800 rpms is standard for that engine and after a couple hours run should not reoccur.
There might be some who disagree with that but it happened quite frequently on a Cal 2-46 that had the same engine I used to sail.
I wouldn't have a clue how saltwater would be entering the crankcase on a freshwater cooled engine? Pat's suggestions and Gord's questions are pointing in the right direction.
It will be an expensive repair so what I would do is change the oil one more time and have it tested (by a lab of your choice) after another couple hour run once again. If it persists then ask for a significant discount in the negotiated selling price.
Kind Regards,
JohnL
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