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Those units used tobe hard enough to get hold of when they were common place on cars.
These days you will problably have a rela job trying to get one. Might be worth looking for a complete distributor.
have you tried some of the specialists that do older Ford cars.
Another solution is to fit a modern ignition system that has a pick up in the distributor and does away with the mechanical and vacuum advances, using electronic advance instead. Much more reliablea nd once setup the timing does not go out.
 

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Try Precision Ignition services in Nunawading in Melb... they may have some clues.

You cannot just do away with the vacuum advance/retard unit on the side of the dizzy.

It retards the timing at low revs and low vac situations which aids starting and improves fuel efficiency.

It advances the timing at higher revs which aids in achieving maximum power.

Note that the timing curve on these old dizzies should be modified.

They were set up for unleaded fuel.

The retard is OK but there is too much advance to suit ULP.

ULP burns much faster than the unleaded fuels.
 
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