In the middle of swapping the 5.2 in and have some confusion on the injector wiring. Does the #1-6 injector plugs on the factory harness stay the same on the V8 then you add 7 and 8 in the back or does 1-6 become 3-8 and you add the front 1 and 2? Keeping 1-6 and adding the back two seems to make the most sense, but it looks like it will make the harness too short.

 

Compare wiring diagrams between the two. I do believe though, that you are adding 7 and 8, as on the six, they won't be there.

 

1-6 stay the same. You add the PCM ground trigger wires for 7 and 8, and splice the power side to the ASD wires already present. Plenty of room.