Some dyno testing you guys may want to follow on YouTube

When your just a bystander, you can’t really complain if someone else’s dyno testing doesn’t follow the priorities you’d have if it was your test.

That being said, “if it were me”……. And I was going to orchestrate a SBM head shootout test……..I’d want to use a short block and induction/exhaust system that would make it so the heads are the HP limitation.
Big enough cam, maybe a ported manifold, good sized carb and headers…….parts you’d expect to be capable of producing in the area of 600hp.
Then, see how much of a limitation each head presents to the combo.
This is very close to what I am doing, 410 with 11.1 compression and an older hughes/engle sft with 257/266 @.050, .587/.602 lift on a 107 ls. So far for intakes we have an rpm, victor, m1, also 1 7/8 headers and an 830cfm blp carb.