red82gt's advice is very good. 11:1 pistons would very noticably increase your power, but you have to have the fuel to run them. 93 octane wouldn't do it. Also, as mentioned, if you ever plan on adding forced induction, forget 11:1's. If a blower isn't in your future, 10.5:1 is the highest you can expect 93/94 octane to handle, and would provide alot more torque (acceleration) than 9:1 pistons. You should only do so if you have a cam (and intake) that is designed to run with compression that high.
Take care,
-Chris
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