Awesome thread! thanks for all the progress pics. As you know, I'm currently doing a similar build on my 03 4.6is. I spun a bearing and decided it was the perfect time to do an LS swap so I bought an 08 Chevy Express van 3500 with an LY6 6.0L mated with a 4L80 tranny and pulled my engine yesterday to make room for the much bigger, but narrower LS.
I labeled the wiring coming off my engine and have the whole wiring harness laid out so now i'm tracing the wiring back to the ECU but any wiring diagrams on pins would be super helpful.
Also, pm me on your motor mounts details. thanks
Keep up the great work!!