well whats the reason for using the f22 bottom end, because you already have one or what? cause the JDM h22's are closed deck unlike the later model USDM h22a4's, so if you were going turbo then a jdm h22 bottom end should be sufficient... but for the labor it will cost you, and parts (if you dont have the f22 bottom end) then it might be worth it to go with just a complete h22 swap....