Isn't your engine a 5.9L Magnum V-8 (360 cu in)? The pickup in the distributor is a "cam position sensor". It is Hall-effect type. It does not give a signal for each spark plug firing, so it cannot be used with the GM HEI ignition module. You would have to install an electronic distributor w/ 2 wires (VR sensor) from an earlier LA engine. I think they will fit the hole and slotted drive. They are taller, so you might need to move something on the firewall.
