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Koates is right-on. Your 2.9 volt input to coil is good. We will never see more than 3.0 volts at the coil with engine stopped. (with engine running, points opening and closing, averaged voltage reading there will then jump up to 3.5 or more) Nothing wrong with your ignition resistor, switch, or the rest of the circuit providing input to the coil. Problem is elsewhere.
Koates is also correct in that the ignition resistors are rarely known to fail. Coils are known to be fragile, condensers fail including brand new ones, ignition switches get dirty and create a voltage drop, but the resistors are very robust, most original resistors still function just as designed.