It might be worth studying intake manifolds with long runners that were designed by Chrysler afterwards.

The iron V10 truck engine manifold has 25 inch runners with EFI.
The “plenum” volume of this manifold is far larger than the Long Ram.
This probably works far better than the balance tube.

The Magnum V8 “beer barrel” manifold has 15.5 inch runners and a HUGE plenum volume.

My memory is a bit fuzzy but one of the college textbooks on Internal Combustion Engines has several pages on a long runner intake manifold that Jaguar designed in the 1970s with example mathematical equations filled out on how to size the runner cross section and the cubic inches of the plenum.

The $140 software program Engine Analyser 3.0 from Performance Trends has the ability to analyse more than a dozen intake manifold designs and asks you for runner dimensions and plenum volumes.