It sounds like a very interesting combo and I spec'ed out a similar treatment for a Bonneville application. It used a 326 block and a 303 crank for 255 cubic inches with a 3.78-inch bore. It was never built but in a situation where the weight of the engine was not a factor, like in land speed competition, this would have been an interesting alternative to the 255 Chevys that were dominating the class.
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Founding Editor-in-Chief, Poncho Perfection 10/1/15-12/31/24)
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"Grand Prix: Pontiac's Luxury Performance Car" (4/27/07)
"How to Restore Your Pontiac GTO" (7/15/2012))
"Pontiac Concept and Show Cars, 1939-1980" (3/25/16)
"Pontiac Performance 1960-1974: The Era of the Super Duty, H.O., & Ram Air Drag & Muscle Cars” (10/15/24)
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