340 General Rebuild Info- Cam Recommendations

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Ballast Resistor for Points distributor
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When the key is in Run, the ignition run wire from the key switch is hot. It supplies power for all the function needed to run the engine, and nothing else.
So this is power to the coil (thorugh the ballast resistor), power to the alternator's rotor, and choke electric assist if so equiped. ( I don't know what the othe stuff is in you photo that is piggy-backed onto the terminal. )
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Full diagram is in the service manual.
You car has the Ralley Dash. Which a lot of us like.
Clutch fan. Did Mopar do this for mileage? Less drag at speed?
Yes.