Frustrated...need help!

[Hallaian42]

Ok here's the deal...i just bought a 240z from a salvage yard...in other words i have no idea of its history. I first noticed it had the L28 engine in it w/ the fuel injection...So i called to dealer to find out what year my engine was; they said it was from a 79-83 280Z. Here's my problem...i got a repair manual for 70-84 Z's and i can not match the right year of my engine to corrospond with all the componets to save my life. It looks as though it has a 75-77 or so ignition unit because it has that ignition control unit in the passenger kick panel (not on the side of the distibitor). I think there is also a risistor in-line with the coil and EI control unit. Many of the wires in the wire harness do not match what the book says and some are colorless. I dont know if this thing needs an O2 sensor. There are wires that are loose and i cant figure out what it needs or doesnt need. I need to know if this thing is california model or not cause that changes everything. I riped out the entire dash trying to trace wires and everything. How do i know i have the right ECU and where can i get a wiring diagram for it...WHAT DO I DO!!! ??? If anyone has any advice on how to idenify everything and solve some problems it would be much appreciated.

All in all the car still runs great but it seems to be running too rich...so this is why i need to check everything

[Hallaian42]

I just realized something... I also noticed that my head was a N47 head... I know that those were heads from 77-80 with the flat top pistons and in 81 they came out with the dished pistons and p90 heads... Is it possible to have the n47 with the dished pistons...Is this un-heard of? So could it be safe to say that i most likely have the 77-80 EFI and ignition setup? Let me know your thoughts...Im totally new to these cars....Or maybe cause im only 19