High Amp Alternator Charging System Question

I would use a circuit breaker on the battery wire. Another trick I used was to mount a Ford starter solenoid in my trunk, and run a separate wire from there directly to the starter so I could use an unfused wire with no connection to the shut-off switch to the starter that was only live when cranking.

What you have will work as long as you are not looking to pass an NHRA tech inspection. You will need a rear mounted kill switch if that's the plan.