Highest flowing sbm heads?

I too am old school. Very old school, just look at my builds.. LOL. However, I'm a realist. I have no issue accepting reality. If I choose that route or not, I'm not afraid to acknowledge it. And although I'm not "hemi swapp'n" anything of mine today, for the sake of the OP I brought up the New Hemi's and their heads. We cannot ignore how fast those heavy pigs can be box-stock off the showroom floor. And with mods, they can be crazy fast, especially when swapped in a under 3000 lbs car.
True story....a few years back a couple friends would come around sometimes and we would take our cars out and cruise and race....the one had a 2016 Scat Pack Challenger with a new Pro charger on it and the other guy had a 2006 ZO6 with a 427......every time we would stop anywhere the other 2 guys would get comically pissed because nobody looked at their cars and to add insult to injury I smoked that Pro charged Challenger so many times, never got close to getting beat, that I finally had to tell him no more as the price of tires is high and he was no competition for old school technology.