When you say “this is what I need”
you need the Caldwell Development restricted Dodge V8 header, near the end of the article, right?

sample quote

The last photo shows a header we built for Caldwell Development for a Reynard chassis Lemans Prototype powered by a restricted Dodge V-8.

Because of the restrictor, the engine rpm was limited making it an ideal application for the 180 degree header layout.

end quote

I still have doubts,
but agree “it ain’t the craziest experiment ever funded”

Before welding metal
I would try computer modeling the torque gain of such a header in the rpm range of 1200 to 1600.