Offenhauser equa-flow manifolds for the 1965 273 engine

I wonder what the old Offy catalogs say about this one?View attachment 1715607375 View attachment 1715607376
The folks on the RV & Ramcharger sites say they are the torque king of the low rpm manifolds, and that only boost makes more usable power in a heavy vehicle from off idle to around 3500-4000 rpm.