The pertronix is great for the later engines, but the early pre-68 distributors have no mechanical advance, hence the reason for my duraspark...
Go to Ford Six and click on the Tech link. There's a page on how to do that with a variety of modules.
The 200 and the 250 have the same 3.68" bore but the 250 has a 3.91" stroke vs the 3.12" stroke of the 200. With seven mains, the engine can...
go to http://fordsix.com and hit the link to the forums. There's plenty of six cylinder advice there. The Aussie Crossflow Mustang is mine....
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