Now that the motor was installed for the last time we were able to address the wiring and plumbing. For the engine wiring and ecu we decided to go with Holley's new EFI system. The system comes with the engine harness and a new stand alone ecu. As with any aftermarket harness it comes with all new factory colored wiring and plugs. The harness is completely independent so it has an integrated fuse box for the ecu and fuel pump powers. Where the Holley EFI stands apart from the the rest is it's ability to self learn. Once all of the basic perameters are entered and the car is running, you can put it in learn mode and let the ecu tune itself. Our 5.3L had a cam, valvetrain, LS6 intake, throttle body, and the MAF was eliminated. I was new to the software and it took me about 30 minutes to plug in all of the information. Once I had it loaded the car fired up on the first try.
The ECU itself is quite compact and was right at home mounted in the glove box.