NEGATIVE

No understand

The main cable was likely no4, it does not hurt to upgrade the gauge, but good looking finding them in current so called parts stores. I would for SURE upgrade the battery to body ground, but you can actually do that from the block to the body. Use a Ford style "eye to eye" starter cable.

On V8's look at the front of the pass side head. Those same holes are on the rear of the driver's head. You can put a short bolt in, with the cable, and then ground the starter cable to the body. 1 ft, or 18" and sometimes the studs for the master work OK.