I've heard of many people throwing a b20 block with an ITR head or B16A head with a turbo kit and seems to work fine. I never really got a chance to get detailed/accurate info on this set up, i.e. pro's, con's, what the CR using stock headgasket, is an aftermarket headgasket needed? How much can you boost on a stock bottom b20? I've heard of people doing as much as 10+lbs with fuel management.. anyone have this set up?