72 340 pass side manifold

Supposedly the magnum manifolds are the best flowing. Kim
possibly...but at what rpms? I'm thinking 'any' 318/340/360 manifold likely flows equally enough up to ~4000 rpm to be 'moot' from a performance standpoint, and I've also read they are likely better flowing in the higher rpms...but not by a lot, plus my engine won't be in the higher rpms enough for any flow benefits to be worth the plumbing hassle, so in my case 'better flowing' doesn't always equal 'better'...?

The Jeep Grand Cherokee manifolds have 2-1/8" outlets, but those aren't any better fitting than the other magnum units...s'why I'm looking at these center dumpers.

I'm likely going to use the GC manifolds on a hot magnum 318 going in my 71 Demon...but that's a different story... :)