Here is the flow sheet on my ported indy dual plane.
In the December 2005 issue of Mopar Muscle Steve Dulich tested a ported indy dual plane and a indy single plane on a 440 that had indy CNC ported SR heads and a solid roller cam, the single plane made 15 more HP.
I do not think the Moddman intake would be an inprovement over your DP indy.