Does resistance at the distributor cap center contact matter?

[Old Henry]

I got a new distributor cap for my 47 V8 and got all of the wires installed and checked continuity between the distributor terminals and the end of the wires. All is well except the center coil wire terminal. There is complete continuity to the outer ring of that terminal but the center rounded part has about 30 ohms resistance. The new cap I just took off has the same. The old cap that new one replaced had no resistance. I checked two other old caps. One had resistance and the other didn't. The center contact has the appearance of brass around the edge with a black domed insert that has the appearance of carbon. See photo. There is no resistance from the wire end to that brass part but 30 ohms resistance at the "carbon" center.

Is resistance of that center contact point OK or should I keep buying new caps until I get one without any resistance?