Built several engines with ported 906, Indy heads 440-1, and EZ heads, my personal race engine has the Edelbrock Victor Jr. heads, mainly because Russ told me one time I could never build a 9 second car without buying his parts. Well my car has went 9.64, and has no Indy parts on it. I have never ran B-1 heads, I hear they are the best. The Indy 440-1 I believe will make more power than the Edelbrock victor Jr. My engine with the Victor Jr's made 720 HP @ 512 CID. I have seen and built several 440 based engines over 800HP, all had Indy heads. Heads are the biggest factor in making HP, but not the only thing, when you want to go over 700HP you have to have a lot of ducks in a row for it all to work. You asked, just my opinion. Lots of guys on here most likely know more than me.