The old Chevy inline 6 is a reliable piece . There many parts available Clifford made intake manifolds 6=8 cams and such a lil research will bring a wealth of info. Contact the manufacturers for there advice on combinations for marine work ignition systems -going to a updated pointless design making spark more reliable . Exhast would likely be the hardest hop up design to find but I'd bet there's something out there. In the end it's just a air pump more in and more out = more power but it must work as a combination!
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