ya hes right

just like EF8 is a chassis designation for a CRX a Z31 is the chassis designation for a 84-89 300ZX. turbo 84-89s are called Z31T. but my car is a non turbo body
the 90-96 Zs are Z32 and Z32TT
70-78 Zs are all S30
79-83 Zs are all S130

hope this helps