16168625 ecm pinout help

[Adavis]

I have a 1988 gmc 1500 5.7l tbi with a 16168625 ecm. I pulled the motor for a rebuild and was in the process of replacing wire loom and cleaning up the harness (no mods just clean up ) and I cant for the life of me find the knock sensor plug, ok so I go looking for the ESC module so I can trace the wire back but there seems to be no ESC module or even a plug for it, so now I am on the search for the correct pinout for my ecm so I can confirm if the ESC is intergrated into the distributor or the ECM. the engine had a knock sensor installed in the factory location when I pulled it just no wiring. I'm putting everything back to original factory specs. Any help would be great