Thanks for the reply, but I plan on keeping the compression ratio stock because as I said pump gas is what I want to run on and it's my experience anything over 10 to 1 needs a little more octane.
The static compression, is not the concern, but rather the corrected compression ratio, as that is what the engine sees when the cam bleeds it off.
Set the school-bus 255 cam at 9.9 cr and it'll have uncontrollable spark knock, to the point of even engine damage.
Set an S&S .640 at 10.2, and you'll feel like you threw an anchor overboard, (and could damn near burn kerosene in it) with it's 60* intake closing number.
A correceted compression ratio, of 9.4, is generally a good safe area.
Scott