Engine Combustion Chamber to Compression estimator?

Is there an easy rule regarding how many points of compression are added based on the size of the combustion chamber? In other words if you have a stock 9:1 CR with 64 CC chamber, how much to you gain with a 60, 58, 55 CC and so on...
 
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OK, dome volume and deck clearance? How do I determine that? The engine in question is an older M-6007-B351 GT40 351 crate engine. It was a factory 9.0 CR with the cast iron GT40 heads. So essentially I'm thinking of trying to hit 10 or 10.25 CR with a tighter chamber.