Max horsepower with EQ heads?
Along IQs lines... I "think", it might be better with a 3.58 or 3.31 stroke crank and more rpm. The EQ heads are good - but I'm not sure with the long stroke they will make the real big numbers. Come close, probably, but I think if you want high side of 650 it's just not doable without basically recreating the head. Which sort of defeats the purpose.