My setup is not actually my setup, is a refreshment about what maMopar made on fleet cars with big capacity alts, just saving the bulkhead weakness to the high loads.
MyMopar actually just run the thick wire straight through the firewall on these cars. I'm talking about get a parallel path because if the existant wire is still there in good conditions, you won't need to remove but reinforce them.
Factory already feeds everything from the alt side of the game, except the starter motor... and some ocassional heavy loads devices like as far I have known, power windows.
Then with a high amps alt able to feed the car requirements, the batt will never ( or barelly ) be sucked out, what it means will never ( or barelly ) will demand to be recharged. But to make this for real you need to guarantee the bigger alt capacity at the lower speed as posible. A car what requires 50 amps to keep everything working will require 50 amps no matter the engine speed ( ignition barelly changes the load with RPMs )
After the alt is upgraded, you need to be sure the weak points will hold the car requirement, this is when wiring and terminals needs to be upgraded.
Tipically lot of ppl sourced extra added accesorioes straight to the batt pole. BIG MISTAKE, this will be read by the ammeter as a discharged batt, then begins all the stress between alt and batt, ammeter and bulkhead included. This become worst when the back and forth ammeter readings while you speed up the engine. No matter where goes the load, but as far runs loads through the ammeter, charging or discharging, will stress the ammeter unnecesarilly. Keep all the loads at alt side with a good alt and the ammeter will be mostly out of the play from any kind of reading