Motorcraft or Prestolite? The Prestolite that came stock on my Jeep left me stranded more than once. Either way, you need the wiring harness and ECU that match the distributor you have. Then it's just a matter of mounting the ECU, power, ground, and hookup to the coil.
Personally, I'd go with the HEI that MC sells here at Bulltear. One wire hookup and you're good-to-go.
http://www.bulltear.com/catalog/index.php?cPath=30&osCsid=3022aeb9a65d58fc240b1139e5d8a8a9
Bob
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