there are 4 proper jack points on ya r33, under the sills on each side of the car there is one at the front and rear of the sills, you will see them if you look under the car and alont the sills, the metal is re-enforced and bulges out a little cos its thicker and there is a hole through the middle of the bulge, you can see where they are easily bu looking for the notches in the sill..
This is the best i can explain it, there is actualy a picture of the jack points in the r33 manual thats available for download.