I ordered a 3G 130amp alternator from PA Performance a few weeks ago after my 100amp Tuff Stuff failed...again! It was supposed to be a simple bolt in but things never work out that way for me. The dimensions are very similar to the stock unit but the terminals for the battery output are on the opposite side putting them directly infront of the cylinder head.
It may be because of my TFS heads but I ran into a clearance issue where when bolted down the battery output terminal would rest against the head. Obviously this is a problem because it grounds.
Not one to give up easily I whipped out the grinder and the Dremel. I ground out the corner of the head about 1/4" and then gave it a nice smooth finished look with the Dremel. Now with the alternator installed and bolted bown I have almost a 1/4" of clearance.
It is also not truely one wire. It requires a battery out and an ignition 12 volts in but a ground to the back of the unit is also recommended. I don't know about you but I count 3. For those who are planning to do this an easy ignition source is the wire going to the "I" terminal of your stock voltage regulator. Something else they don't tell you but that is recommended in the directions is that you install a fuse on the battery out with a rating of between 125-200amps. The wire should be #4 or #6. I'll be out looking for one of these fuses today.
The good news is that in my short test it puts out a good amount of power. With my fuel injection(electric pump) running, both electric fans spinning, and the headlights on a quick test showed 14.25volts at the battery, at idle! Without the fans and lights it was about 14.6 volts. I should never need more power than this. Hopefully it will last.
65 Stang - 342 Hydro Roller, TFS high port Stage III Heads, Nash 5 speed, Fuel Injection, Long Tubes