The spaghetti does not bother me much. I have to sort the harness anyway. The first owner removed the original 3.5 unit and fitted a 4.6 EFI in there. He then removed the 4.6 unit and refitted the 3.5 unit with EFI. The second owner screwed that 3.5 unit and sold the vehicle to a middle man, the mechanic where I bought it from. He then fitted another 3.5 unit in there, removed the EFI and fitted a Weber 38. I cannot explain the mess that is my steering console. The engine bay is full of wires and *stuff*. I will remove the entire body, in time, build a new harness and fit the new harness. If I go for the 3.9 EFI motor, I will do the harness with it. If I keep the 3.5 carburetted motor, I will do the harness.
So what I'm trying to say is the harness will be replaced irrespective of what engine I choose.