Has he research the wiring at all? He's putting an OBD1 or OBD2 engine in an OBD0 car?
I've done it personally, and still have the schematics lieing around for the OBD0->OBD1 conversion harness.
So, basically, that harness ( it goes under the passenger floorboard to mate the chassis harness to the OBD1 ecu). A chipped P28, see above.
also you're going to need a custom engine harness. I've built these, also hasport builds these.
Let me know what else you would like to know.
-PHiZ