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Kevin, You don't mention if it's a gasser or a diesel. If a diesel, NOTHING needs to be changed to change the ground polarity, other than swapping the battery cables. If it's a gasser, the coil primary leads need to be swapped, as well, so the wire from the coil's (-)terminal goes to the distributor. Avoid the "one-wire" alternators, and get a REAL 10SI Delco alternator, and connect it up to the "idiot light" you already have. (Which must be FUNCTIONAL for the alternator to "excite".) The standard unit will "excite" at a lower speed than the (goofy) one-wire units. 
If you can find the wire comming from the "idiot light" that's been previously connected to the "GEN" (ARM) terminal on the generator's voltage regulator, and connect it to the alternator's #1 "switched excite" terminal, you can OMIT the diode shown in the photo. If you choose NOT to use the factory "idiot light", you can use the diode (as shown) or a 10 Ohm, 10 Watt resistor in the "switched excite" lead. Only ONE of the choices needs to be used, and ALL three... light, diode, and resistor, work equally well.
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