Gotta be something going on with the points. Remove the cap, turn the car over and watch the action. Your distributor may be worn. Is there excess play in the cam? Check the dwell for grins.

Or you could just spend the $90 for a Pertronix ignition. It will compensate somewhat for a worn distributor. You will need the Bosch distributor model number to get the correct unit.

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"