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Have you tried the usual major Packard vendors?

Installing a Pertronix isn't particularly recommended, the original type ignition will probably prove more reliable. Major reason for reliability problems with Pertronix in 6-volt systems is the absence of a comfortable cushion between system voltage and the triggering voltage that Pertronix require...

For an ID, how about a vehicle number or motor number or a picture of the motor. The Eight and the 120 are two expressions for the same model.

My recollection is a bit faint from years ago but I seem to remember that the bore in the block into which the distributor mounts has a shallow counterbore at the top for a cork gasket. Its probably missing on 90% or the cars out there and with no consequences other than a very occasional drip of oil.

There are no kits available that I'm aware of, if you want such a conversion you'll have to engineer something yourself. But let me ask, why do you want this in the first place, properly maintained the standard factory system should be fine.

I'd be surprised if it's not pictured in the owner's manual, have you checked there? Also, knowing what year or which OD unit would be helpful.

Here's an illustration from the 1941 120 owner's manual for that information for a similar setup.

Doesn't look like it would be much of a challenge to make it yourself. What do you know of the material of construction?

Hi:
The answer to your query is in the post immediately prior to yours, both the Twelve and Super Eight used the same Purolater L8 filter and R&A Engineering is a source for a reproduction unit.

Spark plug thread repair kits are commonly available and it's not that unusual a repair job, so unless the reason for the failure was a crack you should not require a new head. Sorry but I can't recommend someone to do the job, but ask among your local old car friends.

"O" rings, split rings, or continuous cord graphited packing are all satisfactory, properly installed it really makes little difference which you use. Install packing in the cavity, compress to conform to the shaft and cavity with the gland nut, and as a final adjustment set the gland nut to allow a...