There's one set all the LS boys swear by. They are more "cathedral" ports than some of the rest. I don't know which exact ones, but that's the skinny. Some of the Dodge truck V10 heads had similar ports.
Think it's 706 heads. And I think they only flow like 230-240 cfm and they seem to get well into the 400's hp with fairly small durations like 212 to 226 but with .550-.650"+ lifts and fairly wide lsa 112-116.