I think John T and the Tractor Vet are on the right track: Issue is a mismatch between the coil and ballast resistor. A couple possibilities:
1 � You actually have an internally ballasted (so-called �12 volt� coil). Running it in series with a ballast resistor will cause weak or no spark condition during cranking. Try measuring the coil primary current with the ignition on and the engine stopped (points closed). A properly sized coil and ballast resistor package should draw 3 � 4 amps. Less than that says either your coil or resistor is wrong.
2 � If it's the resistor try one for a 60�s era Chrysler product (Autozone #AL725 or equivalent � about $7) and see what happens. It has much lower resistance for when cold. After starting it takes a minute or two for it to heat up and develop full resistance. This provides more coil current and a hotter spark during cranking.
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