Hey your welcome and here is a very simple & user friendly CR calculator. http://kb-silvolite.com/calc.php? EDIT I reread your specs and more than .045" quench is going to require you to run a significantly lower CR with any given pump gas. With your choice of cam decide on a static CR to get the right cranking CR for your intending octane pump gas. this leaves nothing on the table with your short block then consult with your machinist & get each cyl's CR and quench exactly where you want it.