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Andy, If you do not already have one, get a Delco 10SI alternator with an INTERNAL regulator. They were used on GM pickups and cars from about 1974 to 1985, or thereabouts. They are available from "boneyards" for as little as $10.00, or rebuilt from $30.00 to $100.00. Use a simple harness as shown in this picture to jumper the # 2 terminal over to the large output stud. Connect the large output stud to the battery (through an ammeter, if desired). Then, run a wire from the #1 ("switched excite") terminal on the alternator to the coil side of the ignition switch. To prevent the engine from continuing to run when the switch is shut "OFF", and to protect the guts of the alternator, you must install an "idiot light" (with a "194" bulb), or a diode (as shown in the photo)... 1N5008 works GREAT, or a resistor 10 Ohm, 10 Watt, I believe) in the lead to the ignition switch. (The cathode end of the diode, marked with the white band, goes towards the alternator's #1 terminal. The diode is shown "bare" for illustrative purposes, only. I cover them with 2 layers of heat-shrink tubing before installation to insulate them, and provide stiffness, to prevent the leads from flexing and breaking.) 
Some folks will tell you to get a one-wire, self-exciting alternator. That is an aftermarket conversion of the alternator shown in the picture, with non-original changes to it's guts to eliminate the need for a wire to the #1 "switched excite" terminal. You will likely pay MORE for the one-wire "aftermarket" alternator, it will not begin to charge at startup (until the engine is "revved"), and they are prone to draining the battery during periods of non-use, compared to an "OEM-type" standard 10SI. And, down the line, if it ever causes trouble, you need to remember it is an "oddball", and get another one-wire unit to replace it. If the alternator you have differs from the picture, and is an older Delco requiring an EXTERNAL voltage regulator, and you want to use it, I can get you a diagram for that, too, but it's a lot more wiring to do, compared to the simple internally-regulated version.
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