Highest Amp Alternator For a 72 Duster

I'm going to be upping my alternator to a squareback 100 amp style this spring to handle my new stereo and some extra stuff (electric fans, lights, MSD box, ect). I'm going to be doing my wiring per the below link. I figure if it was good enough for factor MaMopar cop/taxi cars it should work now, no sense in reinventing the wheel.

http://www.allpar.com/fix/alternator.html

As far as the stereo goes I'm going with 2 12 Dayton Audio subs, and Kicker 6x9 (rear deck), 4x6 or 4" (kick panels), and 3.5 (dash). Sub amp is a Rockford Fostgate T1500-1 and the other speakers will be powered by a Rockford T600-4. Something that will "bandaid a weaker system and help with the big one time bass hits is a capacitor. I'm going to run a 40 farad cap which is overkill (rule of thumb is 1 farad per 1000 RMS watts) but I rather have some extra headroom given how small of an alternator I'm going to be running.