Are your sure the coil is still getting voltage when cranking?
Lots of older setups had a second wire feeding the coil, that worked only when cranking and also bypassed the resistor.
I would check the voltage on the primary side of the coil while cranking first to find out what is happening. And yes it may just be too low, or NOT be there at all. This will tell you how to proceed.
To throw more variables... the voltage test could tell you the starter is dragging and or the battery is weak or have too small of cables... but proof will be the voltage test at the coil.
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