Assuming there's no additional loads that will be draining the battery (like EFI fuel pumps, or electric fans), the optional '73 factory wiring is a ggod way to reduce the load through the bulkhead connectors.
You could leave the original alternator output wire in place if you wanted. It would just be a parallel path to the main splice.
You could also temporarily leave the original battery output/feed to the ammeter as long as you watch the current loads and make sure they don't stay above 15 to 20 amps for any length of time. Really that's the only issue with a high output alternator. It can charge at higher rate than the standard ones. it may not do it at idle (depends on how its made) but will definately be able to do it above idle.
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Because two parallel fusible links defeats their purpose, it doesn't makes sense to have two parallel wires from the battery to the ammeter stud. That's why the battery feed line should be either what is shown above
or the standard routing.
