the b16's and b18's have interchangeable heads right? i mean one b16 can swap heads w/ any other b16 and any b18 can swap heads w/ any other b18 right? well, would the f22 be the same way? i have a friend w/ a 92 and he wants to put the f22b head on his f22a block. if i remember correctly the f22b is the twin cam 2.2 that came in the 92s in japan. would he be able to pull the swap off, or it all just wishfull thinking? and even if he did pull it off, would it be worth the money he'd blow on getting everything shipped over?