Whats the complete Part # ?  I can check Parts Catalog and see what they fit.

  

Well that's just it, I don't know the full part #, I wrote Bill Wilson but haven't heard back. B7A is a guess, but. I think the '57 cam might be correct judging from pics, but I've seen this movie before.

The cap is a NOS Standard with the brass terminals, wear was even so I doubt it's out of round. Just for fun measure the rotor height with and without the Pertronix ring on it.

Basic PN 12210 is the points actual cam. Do you need the cam or rotor (12200)?

If rotor, B7A 12200-A is the STD 1957/ .

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Yes. This is a unicorn component these days I guess. What happens is the advance slots get banged up and worn excessively, and the centrifugal flyweight pins that ride in them also get grooved. Then the mechanical advance gets stuck, or erratic/sloppy. The '57 and later "should" work judging by some online pics but I don't want to order the wrong part. Thanks for your help.

I just sanded the bottom of the rotor a little at a time until it measured the same height as it would have been without the Pertronix wheel so that would have been close to .070. I had checked it with both my old Pertronix I wheel and the Pertronix II and they were the same, even same part # cast on the part. 

I bet they used the same one for years, I wouldn't be surprised if the SB 289/302 motors use it also..
The 57 were 26 degrees of advance and the later ones are 24, thats why I don't use the 57.. That was for the cars, don't know about the trucks, I have a 57 truck manual I can check if needed.

Yeah that's what I have now, it's marked 13L but it's pretty trashed. 24, 26 deg. at the crank, that doesn't matter too much does it? Just add in a little more or less initial timing?

The part they have, the full Ford # is B9AF-12210-A ; if it's the same as 289/302 it seems like it would be a commonly available part??

If I do a goolag search it just gets one hit at rearcounter.com and nobody has any. Images search just shows a bunch of houses. "Here's a picture of a bunny with a pancake on its head" basically.

Found a pic of what they are selling and it looks right. I mic'd the other old distributor shaft laying around and they seem to hold up pretty good. I believe with a new oilite bushing installed, some new weights &c etc. it will hold spec even when running points. The trick will be to sneak up on bushing height in the housing exactly the same. It sits a little proud of the base. Don't want to have to drill new holes in the shaft for the collar or gear, don't have a drill press.

Spent an hour looking for the other old distributor cam, and couldn't find it, though the special brass vacuum advance carburetor fitting DID turn up, so I got that going for me, which is nice.

Ted,
It's just my personal choice, I like more initial timing, I use 12 + the 24 mechanical for a total of 36.
B9AF-12210-A That appears to be a 59 part number and would only have 24 degrees. Don't be surprised if later ones have a different number and still could be the same part, Ford was notorious for changing numbers..
I have never got this technical on a dist in the past, I miss the good old days when you just put in a new set of points, condenser, cap and rotor and drove it...