You could've purchased the Holley EFI 558-118 Ford Universal MPFI Coil-Near-Plug Main Harness, like I mentioned in post #2.
Originally Posted by Danny Cabral
If you already have or you're purchasing a new Holley EFI non-LSx main harness:
The Holley 558-307 CNP main harness is for Holley's Coil-On-Plug smart coils and LSx ignition coils (nine terminated loose wires into J1B).
If using Holley's 556-112 CNP coils, the Holley 558-318 CNP coil sub-harness is also required (or the Holley 556-128 CNP Big Wire V8 Kit).
For LSx coils, Holley 558-307 CNP main harness plugs into two GM 12579355 CNP sub-harnesses or Holley 558-321 LSx coil sub-harnesses.
If you had a Holley EFI LSx main harness, you wouldn't need the Holley 558-307 CNP main harness or the 558-318 CNP coil sub-harness.
https://www.holley.com/products/igni...nd_components/ (Holley EFI Coil-Near-Plug Ignition Components)
https://www.holley.com/products/igni.../parts/556-128 (Holley EFI 556-128 Coil-Near-Plug Big Wire V8 Kit)
https://www.holley.com/products/fuel.../parts/558-117 (Holley EFI 558-117 Universal MPFI Coil-Near-Plug Main Harness)
https://www.holley.com/products/fuel.../parts/558-118 (Holley EFI 558-118 Ford Universal MPFI Coil-Near-Plug Main Harness)
https://forums.holley.com/showthread...3038#post33038 (Detailed Crank Trigger & CNP/DIS Conversion Information & Reasoning)

Most people find this document very helpful:
http://documents.holley.com/efi_sele...chart62914.pdf (Holley HP & Dominator EFI Component Selection Guide)
With the Dominator EFI, everything is sold separately. Use Summit Racing's shopping cart for a total price.