Without actually mocking things up & miking everything you could plug in the nominal specs into http://kb-silvolite.com/calc.php? and see what you get for CR. Nominal for the deck is 10.725" then 1/2 of the stroke, rods are 6.768" and your compression heights then the gasket thickness and the head cc's and get a rough estimate of where you are at. EDIT about the "040 lower set" way back I hung some new pistons wo checking the rod big & they were so out of round that I had to find a shop w the fixture that goes under the rod small end to support it as the pistons were pressed back off. 1st what octane will you be running/how wild (or mild) of cam and what CR are you shooting for? and are you interested in getting quench w the 906's? If so it's KB time plus milling the 906 head recesses to equalize the depth and the slope plus milling the flat quench pads on the appropriate KB pistons but achieving quench is for sure worth it imnho.