Indy EZ heads have been out for quite a while now.
One test I've always wanted to do was a comparison between the std port head and the MW head...... Using the same set of heads.

Baseline runs with the heads at std port size and a couple of intakes, then pull the heads, open to MW size, test with a couple of MW sized intakes.

As much as I'd like to do that test....... I never seem to have the time to build a motor for the test, then actually do the test.

So, I'd say Andy's testing at the very least gives people an idea of what kind of numbers are possible from the new TF heads.
It's unlikely they're going to build the exact same motor as he did anyway, so the results shouldn't be expected to be exactly the same....... But there's enough info so you(an experienced engine builder) should be able to have a pretty good idea of where you'll end up.

I could add testing the 240 vs 270 heads to my long list of things I'd love to try on the dyno........... But my advice is to not hold your breath waiting for that to happen.