Vincent,
It sounds like you are well on your way of having a very powerful beast.
I was at Option the other week, and they were building a GT-RS engine in a Silver R33 GTR. All I can say is you might want to invest in a parachute
The top end power is going to be awesome, but I am not sure about the lower rpm power? When you get her done, please post what you think of the whole marriage of the parts and its ability to produce a broad power band.