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I really think given how good a head you can put on a big block, bore size, and durability at that power level it would be the best option to go big. An aluminum big block would be heavier than an aluminum small block, so there's some of the weight anyway. There's no doubt in my mind the big block with the same blower would way out power the small block. If it were a run whatever blower, or turbo you want then I for sure be looking in the smaller inch combos since it's so hard to harness a big inch unlimited forced induction package. Plus I think it's easier to tune and control a motor on lower boost where you don't need to think about boost level, you can just spin the blower as hard as it'll go tune everything else with boost being a constant. The weight for those et's and speed would be a fair trade for that kind of power difference. (just my opinion)

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~50 extra cubes(477-524) at only a 50# weight penalty is a pretty good deal.