diffrences

Hi guys. I've got a 87 325i sport tech1 and i am after a little bit info on the engine i am puting in. Basicly i completly screwed a valve or two, rocker arm and a pistonhead so i'm changing the engine over from a 86 engine to a 88 facelift model. I have noticed a few differences. Water pump...

Hi as above in post what are diffrent on those cars apart from engine and drivetrain. cheers