That manifold is a very poor choice for what you are trying to do. I don't have any personal experiance with the Hurricane two bbl manifold, but if you want "eye candy" it should function well, or a stock cast iron "super six" manifold will be very functional. http://www.aussiespeed.com/details/?page_id=110
Frank (66acuda) can help you out with one of the Hurricane manifolds.