Not Ranked
I think your right LMH, siamese but not sleeved. This, apparently, is an entirely new design based on a Windsor platform but sharing some characteristics of the Cleveland as well. Best of both worlds? Being essentially a "race block" no doubt it is a high strength block casting as opposed to a standard production 351W.
Could be a home run for Ford, BUT, I personally will pass on this. You WILL have to sleeve it if you ever to need to bore it for what ever reason (broken piston ring, scoured cylinder wall, etc.). To me that says it's a "one time" and one time only motor. With such a thin bore left to work with it I'm not sure a sleeve will even work. It could be a "throw away block" if you damage it.
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