I was finally able to get that link with the Dulcich article to open on my phone.
Unless there is a part of it that's just not coming through on my phone, there was really very little info there.

The thing that really seemed odd to me was the low peak hp rpm point for that build.
With that intake on those heads I wouldn't think it would take much cam at all to have the hp peaking at over 6k.

We just recently had a 446 on the dyno with KB237 pistons, sidewinder heads(with my valve job, bowls blended, gasket matched, milled to 80cc), rpm intake, QFT ss830 carb, 250/254-108 solid cam, and my dyno headers on it(2-2 1/8 x 4)...... Which made surprisingly close power to that Dulcich TF build(552tq @ 4500, 550hp @ 6200).

The TF build seemed a little high to me, but the Dulcich build seems too low.
I guess it just comes back to not being able to compare numbers from different dynos.