Dyno a 7.5:1 400? Sure, why not?

IQ52 said

You can change pistons if ya want to, nothing wrong with that. But this will give you an idea of what you can get if you decide to keep what you have.

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Ok, my concern is that I am wanting to go to eddy RPM heads at some point when I can, mainly for weight savings as well as power. Would that affect the CR enough to actually hurt the performance? I currently have regular Silvolite 1263 flat top pistons but was thinking of jumping up to 6-pack piston with valve cuts, L2335 is it?