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Thank you for the reply! I know that block can be built up to a 427 or 454. I want to overbuild it (component wise) in order to deliver big low rpm power without sacrificing too much in the way of longevity and reliabity. Iām repowering a 23 SeaCraft Sceptre IB V-Drive to be used offshore. That model was originally equipped with a Mercury 350 5.7 but was a subpar performer.