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The real test will be when you get some better heads and a bigger cam. With the weak point being the intake, then the big differences between all of them will come out.

This is still great data, shows you don't have to spend money on aluminum heads and still make good numbers for a street car.

Another side question, is about 450hp the limit for stock heads on a 440 as well, with a similar build?

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If by "real test", you are refering to the limits of the manifolds capabilities, I'd agree with you.

As far as this test being a "real test", this initial setup is much more reflective of what I will run than something with better heads and a bigger cam will be. So I'm quite pleased they chose this combo as a starting point.