Fine Tuning a 360 Magnum with a Brawler "Double Pumper"

RustyRatRod said
No. Not under load. Under no load or part throttle it's there, but it's still controlled by the throttle opening. There's only 1 vacuum source and it all drops off under load.

So does it make more sense to run the VA on ported vacuum or manifold vacuum? Or is that really dependent on how the engine reacts to each?