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The average ballast resistor for coils in 12-volt era are 1.3 to 1.5 ohms. Ford used ballast resistors starting in the 1956 change over to 12-volt. The coils were the same basic unit as used for 6-volt but the ballast was unnecessary for 6-volt due to the design of the coil.
The coil in question is Skip's design so I can only assume that he is referring to the 1.3 to 1.5 ohm type.