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Magnum 360
Air gap intake
360 oil pan
Keep the serpantine set up get a cheap in line fuel pump and it will walk all over your current combo. Your current combo is terrible. A piston swap only gets you more compression, magnum heads help power all around but you got to buy different PRs and the heads and still have a flat tappet cam. The best part is you can do it in a weekend VS how long will machining a block have you engine down? You don't even know you can just stick pistons in till you tear it down, the rings on the KB167 go higher up the bore.