you will only need to upgrade the b+ cable that runs from your new alt to the starter. When I installed my 60 amp, I used a section of cable I got from work that came out of a newer ford fusion. The cable size was most likely 6 or 8 gauge, which is overkill, but it was free. I used it mainly because there were already fusible links in the cable, two 14 gauge fusible links in parallel. You will want to run fusible links in your upgraded charge cable, just in case the alternator shorts out internally or your cable chafes through against the block or something of that sort.