More ignition issues on the dart

I have measured Chrys p/ups as low as 140 ohms, worked perfectly in vehicle. My 1972-78 Motors Manual specifies resistance as ok if between 150-900 ohms.
It maybe that different wire thicknesses have been used in the p/ups. Thinner wire will have more resistance.
As for voltage differences, that is affected by airgap, smaller airt gap gives higher voltage.