Good luck. Like stated before, the manifolds will crack. Its not that they are bad manifolds its just something about our engine not getting along with tubular manifolds.
Maybe it has something to do with the fact that there are only 3 cylinders per manifold? Maybe because of so much heat in such a little place?
Good luck man... This is where the phrase "do it right the first time" comes into play. You will find yourself having to pull the engine to replace manifolds.