The carb MSD dizzy is well worth the cash, as for the EFI, well that is hit or miss, I went thru 3 of them each time MSD covered the replacment. Just buy new. And coil, schmoils, whatever, a auotparts house accel works fine.
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Ryan
1990 Mustang GT (In Process)
1993 LX Coupe (Daily Driver, but just choose not to)
2005 Excursion (Big Pig)