D Dart spec. Anyone build one?

Yeah when I was young I saw a D-Dart motor that was being put together short block saw my first dome Pistons on a fresh machine block it was so cool. I think the big secret to the D-dart or one of them was the compression without that you're not really following the recipe.
Stock 10.5/1 pistons were used. They probably switched banks for less drag (because of the offset)

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