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You should have a wiring diagram for your year, make and model of the vehicle your harness came off of

LT1Swap is a great start, but you really need the one for your specific harness.

The easiest way to get them is on Autozone.com website. You have to create an account, but they don't spam you too bad.

After you've created an account, enter the donor in the 'my vehicles', then go to pull down menu called "Repair Guides", select "Wiring Diagrams" then look to the left side of the page for "Select a Chapter". Scroll down a ways until you find "Engine Controls". It takes some looking around to find everything you need, but it is all there. I've had friendly service advisors at my local Chevy dealer pull pages out of the manual for me and print them, and they look identical to the factory diagrams- my conclusion was autozone's diagrams are from GM manuals.

Trust you will find what you are looking for there, and good luck