[911Hopefull]

Greetings,
I'm considering purchasing an '81 911SC with 120k miles on it.
I've never owned a Porsche, I have limited mechanical knowledge.
I realize most of these 35+ year old cars leak some oil, this one in particular leaks
a small amount from an unknown origin on the right side. How much of a concern is this? Does an oil leak mean bigger problems down the road?

Also,
Does anyone know how these generation SC’s fare in a California smog test?
The car is out of state and doesn't require a smog test, I would need one done.
How difficult is it to get the car properly tuned?

Thank you.