I'm glad the car is flying for you mate, it flew when I first had that turbo fitted, guess I just never noticed the performance lessen when that leak started, people always saying it goes well for an old car must have taken my mind off the ball, but at least shes going now.
As for the gearbox, it had some kind of castrol 75/90 put in it when the box got fitted, can't remember what exact spec.
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On a side note, fitted those awesome ARC intercoolers to the 300Z at the weekend, what a difference, less lag and just more power all the way up the rev range, it's like a bloody rocket on wheels.