If its the Green Z with the Stillen GTZR fascia and Type III rear wing then its a very nice lookign car. However, I seem to recall hearing that prior to his ownership it was involved in a nasty accident. Your best bety would be to find a good independant mechanic, have them put the car up on a rack and examine the underside, as well as performa compression test. Hope, that helps.
~Rob
1994 NA Coupe Stage 5
Robert Maddrey AIM: NA300ZXusa Email: Rob@ECZA.org web.tampabay.rr.com/na300zx