Intermittent Ignition Issue [66 Valiant /6]

I'm not seeing a current starter relay....only the new one in the last photo. The other photos show the voltage regulator and the battery. 12.5 volts at idle is low. Does it go up if you raise the RPM? How old is that battery? Have you done a load test on it?
My bad, found the current one, it’s attached, looks very very crusty. Battery is a month old. It goes up if I raise rpm. 1000 - 13.1v, 1500 - 14.4v, 2000 - 14.7v.

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