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I also use the ign. from a '75 in my '69 144S. I made the change in the dead of winter a few years ago and the amount of cranking needed (almost none) compared to the standard was dramatic. I use the car for Time Trial track events and it works flawlessly. The advantages include everything being OEM and ease of installation (for we lazy types). One or two points about trouble spots -- I worked at an indy Volvo shop when that system was in common use so I got to see where the problems (few) lie. The winding in the distributor unit can fail--often giving warning by acting up (motor stops running) when hot and then restarts when cooled. Eventually it can just fail. Easy to diagnos--loss of continuaty through the winding terminals--the cure is installing a new winding unit--but not the kind of job you'd want to do on the side of the highway. I carried a standard distributor when on long trips until I recently obtained a spare '75. The other fault I've seen a few times was that the tiny pin locking the reluctor to the shaft rusted away to powder and allowed the reluctor to shift, loosing any semblance of proper timing. Fixed easily with a new pin.
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