There is a theoretical way (needs looking up again, though!) or you can mock it up with modelling clay and take a more literal approach. You would definately need to cc the heads becouse (as i found out) suggested cc rates are not what you get when you measure for a variety of reasons (head skim, valve seats recut, valve seat recession).
The tuning books provide the detail on this (I,ve used Larry Shepards Small block tuning guide).
Head gaskets/compression ratio
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