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click here for a how-to thead regarding interchanging some other more easily obtainable ignitors for your ignitor which is no longer available.
The MSD 8227 Blaster TFI Ignition Coil for a Mustang will replace the stock coil. Check ebay or JEGS or Amazon.
click here for a how-to thread regarding swapping in a Crane Cams PS91 ignition coil.
BTW, is that asking price in Canadian dollars?