What alternator. Just as a reference, on the fords that came equipped with the 3g alternators (130 amp units) that I've seen at the salvage yards came with 175 megafuses, and they run smaller than #2 wire. A lot of the charts don't give ampacity ratings for short sections of cable such as a 15-20 foot run in a vehicle and a lot factor in a duty cycle. The cable and its insulation needs to be able to handle the continuous upper output of the alternator continuous, but an alternators max output is rarely sustained or even seen.
..5.95 @ 115, 1.30 60', naturally aspirated.
1991 notch, dart block 427W, , AFR225's, super vic intake, solid roller, UCC 8" converter, glide, Carbureted E85, 28" radial.