Best flowing big block heads?

Id like to mention the mopar max wedge stage vi. Not the best ootb but great potential there to make 800 h.p. They can flow in the 390+cfm range on the intake.Definitely not cheap either but there are plenty of intakes and spacers these days for a B stroker and a few for an RB max wedge. The stage vi is raised port design,so spacers are offered from mopar to adapt B intakes onto them as well as adapting rb intakes onto rb blocks. That opens up lots of intakes and carb flanges.