Hiding the wires in engine bay

The big gauge #4 welding wire or whatever you use from the trunk to the distribution in the engine bay ( ie. A big insulated bolt off a piece of plastic) can be put in a 3/8 emt run from trunk to bay along a frame rail. Its Ez to bend in over a round corner. Pot the enss so no water gets in there. With the lug in the motor, you can still jump the battery from there. Might get a ground in there too, but ground battery to chassis back there and run good strap to motor.