I think those are the big 4 cyl Mercruiser/ fords. (Half of the big block 460 cubic inch Lincoln engine) pretty sure they were a factory option in the mid to late 70's. Not sure about performance and/or reliability though...
Just looked it up, the above is the Merc 470 (170hp based on a 4 cyl 224ci engine) it was an option in 1977, was $19,460 list price boat with dual engines.
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