Highest flowing sbm heads?

I didn’t find out till recently that the B1BA is still available. Its a decent head that takes LA intake and headers. You can even put Chevy rockers on it and oil through the pushrod. Thats another good option. I just bought a set complete and ported off an offroad truck racer. $500 for the set. Used heads are out there. But be careful because there is some real junk out there too.