I have done a search, but have found conflicting information.
I have the parts and my father-in-law is a mechanic, he would replace the part but is concerned that the inlet manifold would need to be removed.
The general impression I get is that it's ~1.5 hour job, but the only detailed description I have found (link to american forum) suggests its more 7 hours (for both sides) and it eluded to the inlet manifold being removed, see below.
http://my350z.com/forum/engine-drivetra ... skets.html
Any advice would be greatly appreciated,
Steve