Voltage Regulator??

As others have said its fine.
While running, the system should be near 14 volts, even with a points regulator.
per 1968 Plymouth Service, page 8-96.
Air Temperature 47 degrees F. Voltage minimum setting 13.7, maximum 14.6
Air Temperature 93 degrees F. Voltage minimum setting 13.4, maximum 14.4
Air Temperature 140 degrees F, Voltage minimum setting 13.2, maximum 14.2