I have a 87 GN engine harness if you are still looking, my e mail is Fortune628@aol.com . And it's a lot more cheaper then caspers harness. And it's all GM made.
I have a caspers one. It it less the 2 years old. Coil pack harness has been extended. Removed it to go stand alone fuel managment harness. Let me know if your interested.
Chris BAGN231@yahoo.com