3 wires added to your stock wiring. 1 from your alt to bat posttive 1 from neg to body ground 1 from ground to ground on the engine People usually run it in 4 or 1/0 gauge Don't replace the stock wiring, just add to it.
It'll probably be fail, don't hold your breath. Mind Sharing Why? that little added weight should not be a problem with a big ass'ed motor like that. I dont see why It wont work; though the American way is to make things the same but just bigger.
In most cases we dont need 18's in a wall either. Im sure there are other reasons. Maybe i should patent coils bigger then 4" since im pretty sure they will become the norm