Overcharging Help needed (74 scamp)

Drilling I'll come back to..
Since its already been hacked up a bit.
If you want to take the alternator and/or the battery feeds through a grommet in the bulkhead copy what the factory did. There's already indents for the grommet locations in the firewall.

To me the simplest version to copy is the one that only needs one fusible link.
Its the one the used for defroster grid equpped cars.
How rare is electric rear defrost?

A little more work perhaps is to use this approach from the '73 Dodge FSM
Ignore the field and VR connections as they are specific to the Leece Neville alternator.
It needs two fusible links. A 10 ga to protect the 6 ga heavy wiring, and a 16 ga to protect the 12 ga wiring.
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There's some other variations on the same theme. They all work. Some are easier to retrofit than others or better meet specific requirements.
A couple pics from what I did on my '67 here Firewall pass through