I thought the EFI manifold flows for over 350bhp? Obviously it's design is shite as is the whole path the air takes after leaving the IC! lol
.48 is the restriction? Hmm... I know the cossie housings flow better... Will be interesting to see what I can get out of mine!
.63 is normally terrible on a 1.6 CVH, would be good to see how one responds with your head, cam and manifold though as you are breathing so well over a stock engine.