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. Take a well ported iron W2 or a box stock ede head? No comparison.
Plus, you aren't dealing with a compression limitation issue here.
