There's a thread on 300zx club, complete with video of a guy that did it. T61 I believe too. Wicked fast. Lemme find it for you.
EDIT: T70 is what he ran. Here's the link:
http://www.300zxclub.com/showthread....t=single+turbo
And video:
http://video.google.com/videoplay?do...899&pr=goog-sl
Did the manifold Z31 style. Single end tank on one side, twin end tank on the other to split into the two throttle bodies. Sucks the pictures are down.