The difference is essectially the cam gear. The 85 models that were still carbeurated had an electronic dist. In 87 when they went to fuel injection the electronics of the dist changed. I am using a 85 model Duraspark dist. from Advance Auto in my 86. It is a vacuum advance unit but thats the only difference. For the roller cam you need a steel gear. For a non roller motor you have to use a cast gear. You can change the gear on the shafts as they are the same size.
Brad
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1990 GT, 347, TFS TW Heads, TFS Cam, TFS Track heat, Twin turbos, FMIC, T5.
Built Ford Tough Moderator
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