No the boat was O.F.'s test buck and the big loopers were 89's not 99's.
The loopers aren't even close to the power used to set the 176+ record, I think Paul's estimate is probably right, too.
The question about 60 ci 4's is a good one, as would be a question about 49 ci 4's ... Merc submitted some specs to Claude Fox in 1968 for a 49 ci motor that had a detachable head and differed in some other ways from production Mercs made in that era.
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