If you can't run the Indy Tunnelram, then you're gonna want the Stage V inline dual quad manifold. Being that this is for NSS, Indy has the big box style crossram hemi manifold w/ a couple different tops available (twin 4500 or twin 4150). I'm not sure, but I'd bet the Stage V manifold would make more power than that Indy crossram manifold.
Here's the Indy crossram...
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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