Manifold selection is combo dependent....blanket statements like this are usually just plain wrong.
Like I said in an earlier post, I've run 10.89 with an Air-gap intake (with a 1.5 inch spacer)....I switched to a Victor and I'm still running 10.8 with a little more MPH, but a slower 60'.
With the cam you have, you are right there on the edge where a single plane would probably help more than it would hurt...but you should see what your car likes (try it and see)....but I don't see the intake holding it back much, if any.