I like the RB Z32 idea. Both are boat anchors, so at least the distribution should be close. If you mount it right, it'll fit under the stock hood.

But then there's the insanity part. Obviously you're not doing it for power, because you can make similar power (mid range power figures, not extremes here) on the original engine. People have done it before, so it's nothing ground breaking. Both parts are old, and it's going to eat a lot of cash to make both reliable.

So, if you have a total hardon for this, go ahead. But be warned that only hardcore Nissan dorks like me will think it's cool. Dirt poor drifters and anyone driving a car made after 2003 will not care.