Not sure if the 8HP plug is part of the engine harness though. Nor what else you will need to make it work. Pretty sure Sound German Engineering has a setup to make them work with the factory PCM though.
Without the above kit you will need relays and such.
You still need the PCM though. I would buy the one from the yard and have Sublime do the Crate Motor tune on it.
I know you haven't had much success contacting them, but I know others have. You might try FB, I know he is on there.