A few issues here.
1. wire is copper, this is not marine as marine is tin plated to resist corrosion.
2. heat shrink can be used to cover exposed wire strands.
3. positive connections should be covered by a boot or the entire battery should be in an enclosed battery box to prevent loose items from shorting the positive terminal to ground.
1997 2400 SCR
5.7 Vortec / Bravo 2