Is the same link used on the 66 Coronet with a small block? I save all my old harnesses and you can have it if it's the one you need. I'll check the schematic to find out where it's located and then my harness to see what condition it's in. As I recall they come off the starter relay?
the link goes from the starter solenoid to the horn relay and is violet in color.these relays on 66 hemi cars are on a bracket attached to the inner fender so the link would not be too long