Head flow,vs. cam lift?......

Yup, well said rumble.

I guess any question that begins with "Do we really need...?" is one where the answer for a street driven engine is usually going to be no and the answer for a competitive race engine is going to be "yes, especially if the other guys have it"

Race cars and their ever-evolving ever-improving nature pave the way for street/strip cars though, Look how many guys run W2 heads in their street mill now!