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Your Overton Window has been moved.
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You seem willing to entertain concepts others are promoting, that you previously scoffed at.
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Big overlap at low ripp'ems.
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One can choose a cam profile with larger overlap without suffering reversion at low RPMs. Better?
Edit:
The anti-reversionary header was invented (
it says here) by Jim Feuling.
He developed the center-mount fan and a four-valve head for the VW engine, a W3 Harely Davidson and developed the Quad-4 racing engine:
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In 1988 he received the "Outstanding Technical Achievement Award" from the National Engineering Societies for his "clean sheet" design, development and manufacture of the 2.0L Oldsmobile "BE" Quad-4 racing engine used in the Oldsmobile Aerotech Research Vehicle (267.339 mph International Record, driven by A. J. Foyt). His radical design for the Oldsmobile BE 4-cylinder engine developed the highest specific power output of any automotive engine in history (over 1,270 hp from 121 cubic inches).
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Feuling Parts
Anti-Reversion Headers - Speed Talk