I get the feeling that you are a bit offended by me. Sorry if thats the case.

What you say is true: mercedes makes parts that go on different models. Usually though, only brake, suspension, electronic stuff, that kind of thing.
But comparing a 185 bhp (euro) 280 engine, which originally was drawn in the early sixties (maybe late fifties), with a 326 bhp V8 of the late seventies, for me is to much of a long shot.
If I had a 280 flywheel lying around i would definately have compared it with the m119 crank, but that isnt the case. In fact, ANY make flywheel that i would have lying around of about the same size i would have compared.

But why are you hammering on that 280 'wheel? do you know more about that than me? do you know people who used it in similar projects?

again, no offence.