it's not the static compression ratio but the dynamic CR that really matters, that's why Dan specified what cam he's using. the closing point of the intake valve plays a major role in how much static CR you can successfully run on a particular fuel.
http://kb-silvolite.com/calc.php?action=comp
it's pretty hard to get anyone to nail down a specific guide as to how much octane is required for a given DCR, i think some of the desktop dynos will give an octane requirement, but to get the right answer you need to use accurate inputs.
"Enlightened statesmen will not always be at the helm" ~ James Madison
