compression vs. compression ratio

Cranking compression is an equation calculated by Compression ratio and Valve Overlap of the cam.

Have a look at this guide:
http://www.4secondsflat.com/Racer_Brown_Cam_Specs.html

This page is not yet in the public domain as it's still under construction, but it will give you a good idea of how cam duration and CR affect your tune-up, gearing and convertor stall.

I'll be finalizing it with Jim in a few days and we'll get it positioned into the public domain, you can bookmark it and we'll date it when complete.