Compression ratio calculator?? And power figures?

You can find a CR calculator on the net just plug in the values
For a ballpark number[/QU . Yea ive found quite a bit of them, "kb- silvolite", i think was one, and "bowlings compression ratio calculator", anyone know if they're accurate? Thanks 273. Does having different ignition's help out in the horsepower department, or do they just help out with better starting, and what not?