alternator choices
When I was trying to figure out which alternator to buy, I first read almost everything on this forum about alternators. Then I went to some sites suggested in the replies. The cheapest choice is to go to a junkyard and find a 3G alternator and buy a wiring kit from Pa-performance. The next price wise was a one wire alternator. Then the next choice price wise was a local auto store 3G and a wiring kit. Then PA-performance which was the highest.
If you want to know what amperage you need. All you need to do is add up everything electrical on the car. I figured out that my car needed about 60 amps max. I have an electric fan that draws 25 amps that still hasn't been installed. At the time I had a 600 watt amplifier that I was planning on putting in but returned to the store. Max draw for that was 80 amps. All together that came out 165 amps. Since everything electrical will not not be working at the same time you can reduce that. The alternator I boought was a 130 amp alternator that put out 91 amps at idle and 150 amps max. That pretty much would cover my needs. My main concern was the amperage at idle.
The people who chose one wire alternators like the high amperage, simple installation, and cleaner engine compartment. Don't forget those Powermasters look great.
I chose PA-performance alternators because it was a 90-95 taurus stock type for easy replacement and the way I ordered it it came with a megafuse, 4 gauge wire, wiring kit to keep all stock functions running, and instructions. There are several sites that outline a 3G conversion that are good resources that I can't remember right now. Also, measure the top mounting flange thickness before you go to the junkyard or local auto parts place if you go those routes. The two mounting flange options are 15 and 21 mm. I bought a 15 mm and didn't have to modify anything to put it in.
Good luck.