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Josh,
I have a similar set up on my 911 with PMOs as well. I used to have this similar problem. I thought it was oil being burned at first . However, it was my carbs running rich while at IDLE. There was too much unburned gas being delivered at idle speed at a stop light and as soon as I would pull away it would create a puff of dark smoke. If you can smell the excess gas this may be your problem.
If so I would look at cleaning the PMOs. You can download a simple procedure to do so from the PMO website. Also check that you have all your Carb gaskets in good condition. Just one cylinder could be the culprit if your idle circuit is running too rich to cause this condition.
GM
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