I decided the ECU needs to go just to the left of the driver side strut tower brace for clean wiring, ease of maintenance, and ease of assembly. I wanted to put it under the false floor I'm making in the passenger foot well, but it just didn't make sense as far as routing goes. I also stripped the Holley's universal harness apart, because none of the lengths were correct. Also there were a few things I didn't need like MAP, Fuel pressure, etc.