When a bought a boat with a non-running 4-107 I dealt with a guy in San Rafael who called himself an"Obsolete marine engine specialist".
He said he had seen them running water pumps in wine country - continuous steady state operation, only shut down for oil changes and the like - with 40,000...
We (or at least I) were talking about 30 years ago and earlier.
Getting 400 RW HP out of an early small block made it almost unlivable on the street - needed a cam so lumpy it wouldn't produce enough vacuum to run power brakes..
And it would have gotten about 8 MPG and produced huge pollution...
None of that gets you over 400 HP and over 20 MPG out of a pushrod small block.
There have been major advances in every aspect of car design over the past 30 years.
Well, except weight that is - Keeriste have cars gotten heavy.
It also ensured rich guys building new boats every year or two. :D
It also started the careers of numberless designers to feed that demand.
It was a true golden age of sailboat racing. IOR boats were much better performing than their predecessors. The fact that boats are better now is hardly...
I liken the IOR period to the Muscle car wars - the designs left something to be desired in many areas but they had style and participation that just doesn't exist anymore.
A Peterson One Tonner compared to a '66 Shelby Mustang - think about it.