I have cracked the head on my 1980 323i and am considering taking this opportunity to do a 2.7l upgrade. It has been reported but I'm trying to confirm that I can use the head from the 2.7l e engine with the cam and springs from my 323i with no interference problems??? Is this true?? I know that this is a very common and generally easy upgrade but I'm kinda hung up on this head thing..