Sounds like you got everything pretty well sorted..
Are you sure you wont be needing a fuel pump?
When I did an engine swap with an RB25DET into an R32 with an RB20DET fuel pump, the car wasnt makeing any more power after 4K And thats with a 220 RWKW engine
So Im asuming that an NA pump will have the same if not less L/min capacity than a 2L turbo.
And cos the engines will have similar power outputs, from my experince.. the fuel pump will have to be swapped..
Where will the NOS be injected into the ingine? Mani? Intake? Direct?