when building motors, i figure u carnt have it all.
With The 250 crossflow i built i used an ed manifold, cut down to shorten the runners, and welded to an xf injection manifold. With wild cam, over 260 @0.050 and 560 lift, low in the rev range it made nothing , but at 5500 made 300 hp (220 kw and at 430 nm at 3900. If i used a longer runner manifold, i wouldnt of gained that much power down low, and it would of killed the engines top end pull.
I figure u design cam/manifold/head to all work at the same rpm range, that way when u hit that range all hell breaks loose