Yea! The How to build horse book. Very good information and practical knowledge proven factual through dyno testing. Further more, on various car shows with dynos, IE; Engine masters, Horse Power TV, etc…. They show the use of the extended collector pipe and EM tested lengths on different tube size headers.
I have the metal to build my own now. But now I have to replace my welder. 20 years of service and more than a couple of bad falls, I had to retire it.
I’m sure it’ll be a bit of a PIA to build because of the ability of limited real estate area.
Golden rule to the box, 1 cubic inch of box per cubic inch of engine for each box. 360 CID engine? Two boxes at 360 CID.