Thank you very much for the diagram. According to the diagram on the fusible link, this is what I came up with:
One white wire on the left side is routed to the shunt and other white wire on the right is routed to the starter. If I want to eliminate the shunt, I can convert the ammeter to voltimeter using the '76 or later voltimeter (I'll look into on how to convert it to voltimeter since I think the '76 or later do not have shunt, please correct me if I am wrong). After doing that, I'll ground the distribution block to the starter without using the white wire as what the instruction from http://www.atlanticz.ca/zclub/techtips/fusiblelinks/index.html did for the '76 or later 280z.
The WR wire on the left side is routed to the alternator and the other WR on the right side is routed to the C-5. I am not familiar with C-5, so is that the ignition switch?