Trust me,Eddys DON'T flow that number,out of the box.I spent 40+ hours ,on a set porting.Sold them to someone here.Flowed 280 -ish, at a local reputable shop. Out of the box,maybe 230,235. Mind you,Brian gets,270 with RHS's.
15+ cfm at 400, and 20+ at 200-300 is not close. I know that a OOTB ede does not flow what they edelbrock says on Brians bench. The difference is and could be larger. Better springs and valves on the RHS stuff too.
With a thumpr you'll be accessing about 400 lift and the fill rates at the lower points will help tq. That alone could be 30hp, more likely, closer to 20hp.
The only time I would take an aluminum head over an iron head is if it performed the same or very close to iron counterpart. Not the case here.
Plus, you aren't dealing with a compression limitation issue here.
I do know there's at least two guys on here posting impressive times at the track with stock bottom 5.9s and RHS or EQs. I tend to trust that more than an article showing high numbers. (A nod to your sig).