|John Yukawa later went on to be in charge of the 350Z project team.
Very little has been published in English about this concept. But I did see it @ the Zama facility in Japan several years ago. From what I could tell when I saw it, I believe that it was a KA24DE w. a turbo (AKA KA-T). These pictures are from a trip in 2007.
[ http://auto.howstuffworks.com/nissan-350z-concept-cars1.htm ]
Sorry about the blurry shot
President of Z-Car Club of Northern Virginia
1995 Nissan 300ZX TwinTurbo in Cobalt Green
1997 Nissan 240SX SE in Ultra Red
2006 Nissan Frontier SE in Ultra Black