Highest Amp Alternator For a 72 Duster

Hey looking to put new speakers in need some help what do you guys think will be required to run this properly http://www.onlinecarstereo.com/CarAudio/p_36627_Infinity_69311i.aspx

http://www.onlinecarstereo.com/CarAudio/p_10158_Kenwood_KFC-415C.aspx

http://www.onlinecarstereo.com/CarAudio/p_33876_Precision_Power_P9004.aspx

Also any input on how many channels I need for them total speakers 4 I may put in 2 subs that are 500 rms ea but most likely I wont or ill only put in 1, right now it has stock wiring I put in a new engine harness from herbs but im not sure if its any better for amps I will be doing the big 3 with true 0 gauge wire just because its cheap anyway you look at it to do. http://www.sonicelectronix.com/item...with-True-0-Gauge-100-Oxygen-Free-Copper.html
Thanks guys im really new to car sound systems so any help would be awesome !:sign3: