Need to upgrade 68 Cuda alternator to high amperage

Your current values seem way high. I doubt the fuel pump will draw a steady 13A since that would be 150 W. Most electric fuel pumps draw 1-2 A steady. Your fans won't be on all the time. Most of your figures are probably peak currents when starting a motor and such. I have the original round-back alternator on my 65 Newport w/ electic fuel pump, TBI, and electronic ignition and the only time the battery wouldn't stay charged was when I found one of the 3 alternator diodes had failed. I suggest starting w/ your existing alternator and measuring the actual current draw (alternator output + battery draw) to see what you need. Use a clamp-on DC current probe or put a 100 A ammeter in series for each measurement. You may find that the later square-back alternator will suffice. As mentioned, you must bypass your dash ammeter, or use parallel diodes as I did (search post, too high a threshold for most).