I'm not going far with this topic. I'd guess you've been lead to believe the 318 swirl port heads are the greatest thing but the reality is they are just the beginning of the 5.2 magnum,which shares heads with the 5.9. So why go to any trouble to reverse engineer this? What do you hope to gain? Nothing there,so move along,or not. I don't care to help,just giving some advice based on testing(which is sorely lacking,and getting worse by the day on this site). Good luck to you.You card?info? You mean CARB? theory is sort of correct,you don't need lot's of CFM to make bottom end torque for towing at less than WOT.