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Ignition on, engine running or not?
This may be a normal value when running, but i can't say for sure. If not running, then you are bleeding to ground someplace.
What kind of ignition do you have? Stock points?
There is (stock) a resistance wire in series going to the coil.
Electric fuel pump?
Start pulling fuses to see where to start.
I remember back in the day, it was said to always put the key in the acc position when the engine was off and you were just sitting and using the radio, because, in the on/run position you could have current flow through the points if they closed.