To learn more on this
single/dual/ best runner length
subject,
I would suggest studying the:
Dual carb extra long runner Chrysler manifold on 413 ci 300F
1992 5.2 Magnum V8 "beer barrel" intake manifold and how the center divider changed,
1994 Iron V10 25 inch runner intake manifold
1994 Viper aluminum V10 intake manifold
2003 year 5.7 Hemi intake manifold
Later years variable length 5.7 Hemi intake manifold
Chrysler has provided a kinda "school" about intake manifolds in those designs.
It is also worth reading about how Ford had a actuator valve in their variable length runner intake manifold, then found that they could leave the valve off and let "the airflow decide" which path it desired to go down.
Also
http://victorylibrary.com/mopar/intake-tech-c.htm