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I'd go with the 177. You'll be really pushing that 144, which means it'll wear faster, it'll run hotter and if at some point you end up upgrading your 406 (say you get a swingin deal on a set of heads, or one of your heads gets a crack in it), you are ahead of the game. Cooler boost is better boost. Speaking of cooler, make sure you're running a good radiator, fan, trans cooler - if applicable, and your oiling system are all up to snuff.
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