Fuse or circuit breaker for trunk mounted battery

[DKz Garage]

Hey guys..... looking for some input on protecting my starter wire from battery in trunk. My concern is not so much the positive cable chaffing and then shorting out, but rather, an accident that damages the car/cable causing it to short out and cause a fire. I see that DSE used a 400amp Mega fuse in the trunk as overcurrent protection. I have also seen a dual circuit breaker set up as well (200x2). I'm running an crate LT4, basically stock. Just wondering if the 400 AMPS will hold up on normal starting etc...??

Any input would be appreciated.