I heard someone moved there many years ago because it reminded him of Scotland.----Your compression values are not encouraging to me.----I would install some factory plug wires.-----The ones on there are way too long and look wrong to me.
The wiring tells me it is a 1995 or older.-----If you just bought it , post the compression test values.----Install a new impeller before your first venture out into the ocean.-----Not sure about those plug wires either.----Are they wire core ?