Wiring Harness Question

[Orionsgn]

I'm new to this forum and hoping that I can get some help as I'm in the process up grading my 85 to a 87 IC. I bought a 87 motor with just about everything.

Was wondering which wiring harness should I use. I have the wiring harness for the 87. I don't have the ECM or the coil pack though.

Also I noticed that there are 3 relays that mount to the driver side fender well are those for the power master brake system?

Thanks in advance for any advice,


Scott