Limitations on nitrous with dual planes are common knowledge. Simply look at a typical plate setup on top of a dual plane and it is obvious why it's not optimum. The spray bars are right above the plenum divider, not the best setup at all. Shot size on nitrous should be limited to around 100 or so. The perimeter discharge plates now coming on the market solve that issue BUT you still have cylinder to cylinder distribution issues inherent in a dual plane design.
But there is a few tricks to the trade. You can take a cutter and die grinder and thin down the very top section of the divider so it comes up in a point instead of flat. You can also cut a chamfer in the divider about a inch deep and about a inch wide to help with cylinder to cylinder issues.
My advice is run single plane however if you dont plan on going over 6000rpm a dual plane will be ok. But dont use anymore than a 100 shot as you will be wasting money for no gains. I reccomend zex systems.
Good luck tho sounds like a fun project,keep us informed on how ya going.
And awesome read on head porting :)