I wrote a compression ratio calculator tool in Excel so I could do some planning on my upcoming engine build. There are tons of these tools out there on the web (that's how I tested this one) but the way I learn about topics like this is to follow along the calcs in excel. And then, every once in a while, they are useful. If anyone has Excel and wants this, send me a PM with your email. Let me know what version of Excel you have - I have 2010, but I think I can downgrade it so it will work in 2007 or 2003.
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1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.