If your alternator is a Delco 10SI, and it most likely is, you will have a self exiting,1 wire regulator. Since there is very little difference in the positive ground alternator versus the negative ground one they both use the same regulator. that means the regulator is still a negative ground regulator but is now insulated from the case. The main difference between the positive ground and negative ground alternator if the rectifier bridge. The positive and negative diodes are swapped to create the rectifier bridge for the positive ground unit.
The alternator may need to be externally excited to get it started to charge the first time. this done the same way for either alternator. You run a jumper wire from the #1 terminal to the positive lead. What is different for the positive ground unit is the positive terminal is now the alternator case. Just short the #1 terminal to the case with the engine running and the alternator should start to charge.
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