Your '58 should have a Delco distributor. There should be a Delco tag on the distributor body with the model number on it, it will be a 7 digit number. I've attached a picture of a similar Delco distributor showing the tag. The 7 digit number will start at the left side of the tag.
Once we have that number, we will know for sure what distributor you have.
I will say that Pertronix's website is well known for having the Studebaker (and thus the '57/'58 Packard) applications screwed up.
On this part of the Pertronix online catalog here:
Pertronix 11584, the catalog says its for a '58 Studebaker 8 cylinder but also says its for a Prestolite. That could not be, because the Prestolite was not used on the V8 until 1962.
Once we have your distributor number, maybe we can figure this out.
Attach file:
Delco Dist.jpg (90.69 KB)
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