Models not equipped with EEC-III or EEC-IV use Dura Spark II ignition systems. EEC-III models use Dura Spark III. EEC-IV models use TFI-IV. No adjustment is required on any system.
Fig 1: 5.0L CFI Firing Order & Timing Marks
Fig 2: 5.0L 4-Bbl. & 5.8L Firing Order & Timing Marks