AFR Heads

That's where research comes in, I can guarantee you , you ain't building a 600 hp small block without a bunch of research.

Exactly, if you are looking to make power, you hang out on forums like this, Moparts, Facebook Mopar related forums, attend Mopar race events, etc, etc.
It’s pretty near impossible to not hear about stuff like this.The fact is, it’s still a limited market. They haven’t made LA engines in over 20 years, maybe 5% of guys with classic era cars actually seriously race them, and if you have been in this thing a while, you get to where you know an awful lot of them, especially smallblock guys who race, there are not a ton of us.