360 magnum swap stock efi wiring help wanted

I’m doing a 360 magnum swap into my son’s 67 dart. The engine is out of a 99 1/2 ton. I have the stock computer, stock harness from the computer to the power distribution box, including everything that goes to the engine. I cut off all of the wire from the distribution box to inside the cab where it went through the firewall. I also have the obd plug with a decent length of wire on it.

I have a list of items I need to make sure are powered on the distribution block to make the car run once I put power to the box. My thinking is I can pull the fuses/relays for anything I don’t need and I should be good to go with the wiring I have. I may try to remove the wires I don’t need after I get it running.

Am I correct in thinking I should be able to splice the obd plug into the correct wires that lead to the firewall or have I cut out something vital and it won’t work? Any help, advice, diagrams, pictures are greatly appreciated.