Cylinder Head Porting and Power Production

I freshened a set of 906’s used on a 440-4 NHRA SS build.
It’s a 1970, and I believe it runs the big AVS carb(stock 440 carb).
Flat tops, big roller, stock valve sizes, heads ported but under 203cc intake volume.
It went 9.70’s@3250-ish....... shows 650hp on the Moroso Chart(not dynoed).

The point being........ some people have figured out how to make pretty good power and run pretty fast with heads that “aren’t as good as” some of the stuff available off the shelf.

If you took the newer better heads, and applied the same energy and effort into the combos using them as what was done with the stock heads......you’d make even more power and go even faster.