Engine Will a newer TFI coil work in a Duraspark II system

limp said:

I am an old Chevy guy and I would have loved using an HEI system but, the HEI interfered with the stock Air cleaner......

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This link uses your stock Duraspark distributor.
“Here is the DS distributor running a GM 4 wire ignition module. Now you get modern electronics (same as the $$$ HEI Distr has) that are available in every parts store.”

limp said:

I want to thank everyone for the time spent trying to lurn me here.....
Why can't I use the E coil with my stock duraspark system, keeping the resistor wire??

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Since you asked,
Ignition coils are transformers.
If the input volts are off, the output volts will also be off. The current will also be less, as watts in is close to watts out. (watts = amps X volts) So you’ll have a weaker spark. Driving a transformer (coil) st a higher voltage than designed for an extended period will lead to heat build up and failure.
But running at a lower power input might extend coil life, or poorer ignition system.

Before you try it, compare the input resistance of the flat EFI coil with the round Duraspark coil you are replacing. If the resistance is less on the flat coil, it might overload the other primary circuit ignition components. Based on that train of thought, a flat coil of less resistance might not be a good idea with or without the resistor wire, and a higher resistance flat coil might not put out enough spark with the resistor wire.
Experiment with your eyes open or whatever saying you want.

Typical Ford coil 1985 and newer?
F7PZ-12029-AA

Nice !
82?, 84?