oil - dirty in one intake port

I have 71 911T, I took the carbs off and looked in the ports of the heads. All of them are really clean, but one has a little oil in it and was dirty.
I have the engin on a stand and and have been turning it like 45 degees.
The heads were rebuilt like 3 years ago.
Does this sound like I should worry?

Backfiring can soil intake runners. I'd expect oil to drip around an engine that is spinning on a stand. If you tip it, oil that is in the cylinder can leak through an open valve. Intake valves are on the top though, and the oil would be more likely to come out an exhaust valve. Al well.

I'd suggest you quit worrying and stick it back in the car.

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'83 SC