http://www.fordmuscle.com/archives/2...eb/index.shtml
Tony O'Connor from TOCA Racing ph 07 3290 1606 has used a number of the Cleveland manifolds, and he seemed pretty impressed with the quality of workmanship. I don't recall him getting any significant gains over other brands in his 600 - 640hp street motors. Sorry, but I don't know of anyone using the windsor manifold...
Craig