Its been done. i know of about 4 people that have done this and various configurations like this. the benefit? for one its a cheap hybrid build, 2 you'd be getting a better flowing dohc head, 3 the f22 bottom end has iron sleeves as opposed to the nickel sleeves of the h23/h22 so you can boost the hell out of it and not really be out a whole lot if something happens because f22 blocks are a dime a dozen.