If that is the casting number of the head, it's a head for a VG30DE and some will have "2l" or "2r" after the the "p30".
If the intake manifold comes up in the center and 3 cylinders to each side with a throttle body on each, it would be a 1990 to 1996 300zx or an infiniti J30 engine.
Nissan has reused casting numbers so, it it's not a V6, it you would have to describe whether it is a V engine or Inline and let us know number of cylinders.
Also, nissan reused casting numbers originally used on engine blocks or heads for use on intake manifolds so you would have to provide where you found this casting number.
If it's a non US domestic market, you can add the Leopard, Cedric, and a few others as possible donors.