I did use the bigger oval port intake (air gap), I also tried the Weiand peanut port intake dual plane intake and it worked really well 11.70's as I remember. I did try a ported oval port Strip Dominator but only got a couple of runs that day so the evaluation was not done. Will try it again with my 360 peanut port heads on the next 468. Oh ya, I did use one other single plane intake, it was the Procomp Eddy copy. While it did work pretty good the Air Gap was a touch better. Pretty much a toss up on those two. I have not used a square port intake on an oval port head since the late 70's. When I did the engine pretty much stalled out at 5K, put the old canted Torker back on and it would pull right up to 6500.