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.
Admittedly, Blake isn't always on top of his email.. you have to imagine all of the emails that he gets in a day that are potential customers or people with just a question, plus he's building everything. He's pretty close to being a 1 man show with help from his wife to create invoices etc., but has responded to every message that I've sent him through FB messenger... or phone call. One of the things that you will get with his goods is customization and support. Once it's established that you're a customer and not one of the hundreds that probably email and never buy, he's there for you. Sadly, that's just the way it is. He helped me with a few things on another swap, that wasn't using his parts. He's just a good guy that is just like the rest of us... loves Hemis and Mopar. Again.. messenger seems to work best.
I have 2 swaps... One with a Mopar Crate Harness and one that is purely sublime. The Sublime kit did come in cheaper but I also had the oem 6.4 harness on hand. So I paid $900 for the quick harness, $400 for the ecu but got $100 back for a ecu core return. As a bonus, I was able to have him program my fan on/offs as I wanted, bellcrank plug rather than pedal and something else in the ecu program that I can't remember right at the moment. All in, I was at 1200 bucks. A few wires to hook up, plug it in and done.
EDIT.. another perk for me, was that the Sublime kit has a provision for AC controls through the oem harness.
With the mopar crate harness, I didn't want to pay for an HP tuner and credits, just to change the fan settings.. So I ended up having to run a different relay setup for that. A nice feature was that it was complete. My 5.7 swap did not have a usable harness and the ecu was a 2014 (junk). Another thing that was disappointing about the MCH, is that I had to cut the loom open and lengthen and redirect the battery cable for the starter and the starter lead to the drivers side. The kit is designed around a manual transmission with a passenger side starter. Lastely... there is zero support for the MCH. If you have an issue or a question.. you're on your own bubby.
My 5.7 swap has an 8 speed.. bought the stand alone for it, directly from Sound German. Easy to hook up, with a few head scratchers. You have to add a few wires into the plug, depending on what options you want.. electronic speedo, reverse lights and a brake light trigger that you must have.. and I don't know why it's just not there, since you 100% need it on every application. I made a cheat sheet and chart that I would gladly share. Anyway, hook up a few wires, plug some stuff in and done. Both the sublime kit and the MCH have a "star" connector block that allows everything to communicate with each other.. so the trans knows what the motor is doing and visa versa. It all works amazingly well. With other kits (ie Hotwire), you'll have to tap into the tps yada yada to give that info to the trans.
Last I spoke with Blake, I believe he now has a complete harness as well.. Supposed to be longer, so you can put your ecu in the dash easily. With the oem harness that I have on my 6.4, I lengthened each wire (1 at a time) by 14" just so I could get it all to my glovebox area.
I recently picked up another SGA 8HP kit from Sublime (authorized Dealer) so I can replace my 904 with something more suitable.
Both kits are great. Good luck and I hope you're happy with whatever direction you go.
If you haven't already.. Hop into "G3 Hemi Swaps" and "G3 Hemi Swapped A Body Mopars" on FB. There's a plethora of information there and some pretty good people.