Thought we touched on this in the spam section.....but here it goes again.
First off, this thread needs to be moved to the gear head section. More people might see it that way. I know your used to posting about who is bringing the salad and who is bringing the cold cuts...but this aint Banderlog!!!!
Second, running a square port intake with oval port heads is stupid and will only cost you power. Dart has reccomended running an OVAL port intake with some of their larger square port heads to increase velocity, but only when ran on smaller cubed big blocks (496 and smaller).
Your engine ( a cammed suburban motor) needs an oval port intake as long as you are running oval heads. Look for the right intake or step up the heads. Even when you get your all mighty square ports you aren't going to want to run that square port intake you already have. Consider it a $40.00 bench conversation piece. You can converse about what a piece of shitt it is