A couple of follow up observations.
With the 65 amp B-body wiring, it becomes tricky to run parallel wires from the alternator to the main splice. If we run a FL on each, then we main not be adaquitely be protecting the smaller wires.

16 ga FL ---10 ga ----12 ga----Welded---12 ga---Fusebox
16 ga FL ---10 ga ----12 ga----Junction---12 ga ---switch ---14 ga ----

Now lets say that 14 ga wire rubs on some metal and ground out.
Power from the battery can flow through both fusible links. Sure it will take the shortest route first, but as resistance increases, it will find the next easiest path.


I noticed the Q3 label on my diagram didn't make sense (accessories are switched)so I went back to the service manual to see what it should be - fusebox. Duh!

While looking at the FSM, I noticed there was also a 60 amp wiring option for the b-bodies with a more practical wire sizes to work with.\
Be interesting to see whether it ends up more like the A-body 60 amp or B-body 65 amp wiring.
It looks like the 65 amp was a special leece neville unit. Someone may know more about that.