The harness that comes with the Edelbrock Pro-Flo kit isn't very long. So you are limited on where you can mount the ECU. Since I didn't plan far enough again, I didn't have a hole in the firewall to mount it inside. So I was stuck with having it in the engine bay. I didn't want it on the firewall or somewhere easily visible. So I decided to put it under the battery tray. The problem is the harness is not long enough to reach there. It would get about to the master cylinder.
The connectors that Edelbrock uses are the Delphi brand GT series. The one connector is GT150 series and the one connector is a GT150/280 series. So I purchased all of the connectors, pins and required parts to make two harness extensions so that I could mount the ECU below the battery. If anyone ever wants all of the part numbers needed to extend the harnesses on the Pro-Flo, I can provide all the information.
GT 280 Series Plug.
So my extensions go from the firewall right behind then engine to just right around the master cylinder. It is the two harnesses in the flex loom going up over the brake booster. I may change the routing in the future once I get all of the other wiring installed. But for now this will work.