Highest flowing sbm heads?

What happened to the Airwolf head? Might not be the entirely correct name, but I remember seeing a magazine test of a build (I know, suspect already) and I remember the motor being over 600 hp. No idea on the specifics, but I kind of remember looking them up and they were by Dr. J?

Did they get a different label? Or were they "vaporware"?

Not tossing them out there as an option (I have no input on that topic), just a curiosity.