"Later years will not have one as the spark control is embedded on the prom."

I am running a '89 memcal (ARAP) on my stock '87 wiring that still has ESC connected.
Where is my spark control from with this setup?
Have '89 knock sensor.

 

The '89 MY uses the same ESC setup as the '86 - '88 years (TPI here with the '165 ECM).

RBob.