Coil hookup (pos/neg?)

Which post on the coil does the wire from the distributor go to?
Usually the post, and the connector ring on the wire, are notched at one pole so it can only go one way, but mine can go either way!! So which goes where?
(Just because it has been running the way it is don't mean it's right, or does it?)
It seems the other wire comes from the distributor (POS?)
and the one from the distributor, which is black I presume to be NEG (?)

Just makin' sure.