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HELP me choose the correct cr.

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4G63 POWER
i'm currently rebuilding my 4g63 & i'm @ the point where i need to choose pistons & compression ratio. help a brother out.
here is what i'm working with.
block bored .020" over
head gasket mits mls
pistons = ross
93 octane
evo 3 turbo
560 cc denso injectors
ams ems
max boost around 20 psi or whatever an evo 3 turbo can handle.
i was thinking 9.0 : 1, please advise.
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