Noob Got a 4.8 and have some questions

[Roostboy102]

I just picked up an 02 4.8 cable pull. I'm very new to this and my drivetrain is clapped out. I figured if I was going to upgrade I might as well do it "right"

I'm pretty certain I want to go with a TKO to avoid hydro clutch (unless this is not a big deal to convert). I do want overdrive but I WILL NOT HAVE AN AUTO!

My main question is something that I cannot find any details on: can you leave the factory harness untouched and run the factory fuse block? Or I guess it should be "how". I saw the one guy did it but had no details on it. I understand using the factory harness and block is not pretty but is it functional? If I could get away with this, for now, I likely would change down the road. The cost of the trans and everything else that is absolutely necessary for the swap is high enough already...

I'm pretty decent with wiring but for this I don't think I would want to modify the harness myself. Just looking for your guys input! Thanks

And a pic