The MSD will match your Ford distributor but as was mentioned, you'll need the MSD tach adapter for your stock tach to work, and you may want the reverse-current diode or the ignition key might not shut the car down. This is true for any MSD stuff. FYI, they have a website with all thir manuals posted. Its not unusual for a Ford brainbox to malfunction, but to only go partway out is a little rare. Lots of guys making this conversion carry a spare Ford box in the trunk for when, not if, they need it. Is your mechanic absolutely sure its not the vacuum advance or something similar?
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