I don't see why you would want to run ITB's and 4-1's which are suited to a higher rpm range, but run cams with a small amount of lift with stock springs? Just seems a little counter-productive to me. I would have thought cams on the milder side would work far better with 4-2-1's to help in the midrange and a standard inlet manifold would be fine, cheaper too. It all depends on what you want to get out of the engine?