5.9 magnum intake performance

Question on this same thread - is there a big difference between the Keg Style intake and a two plane intake on the magnum engines? Thinking about putting a 318 or 360 motor, ecu, injector's in my Barracuda along with a overdrive tranny - either a 518 or 46RE. Thought about doing the same thing to a Ramcharger or an older pickup as well.