my 440 has what are called 10:1 pistons - they aren't even close...more like 9:1. i think they figure the CR with closed chamber heads @ 74cc. i went with the XE268. haven't had a chance to get it out yet - hopefully sometime this week. i think i probably could have gone another step larger and been okay, but i wanted to play on the conservative side as i didn't want to mess with my torque converter or change my rear gears (yet )

will post back with more info once i get it back together and on the road