I will soon be ordering a pulley kit from March Performance for my 455, so I need to choose my alternator. My car will not have A/C, but will have twin electric fans (15 amp draw) and a "nothing fancy" stock appearing 4 speaker stereo system. I don't foresee any other power draining add-ons.
Because I am going with the aftermarket pulley system, I would like to get a chrome alternator and power steering pump. I am looking at the Summit website and see that their are a variety of amperage and manufacturers. There are Summit brand, Powermaster, and Proform and they come in 63, 80, 100, and 140 amps.