Has any one on here heard of these, ran these, or know if they are as good as tri state says? http://www.tristatecylinderhead.com/catalog/product_info.php?cPath=42_41&products_id=43 Do you think they would work well on a 331 with a 533 lift comp cam. They have flow rated at 277cfm @600lift intake and 192cfm @600 lift exhaust.