Being a transition year motor you never know. I owned an 86 and have an 85 so I think I have good experience with these since I ended up installing the 86 motor in the 85 using the carbed setup. It could be a left over from 85 or it could have received an 85 engine at some point. Also, it could be the oil slinger and you are mistaking if for an eccentric. In 85, Ford used a 2 piece eccentric instead of the crappier and heavier 1 piece setup. Im willing to bet the timing chain cover has a boss for the mechanical fuel pump, but no hole??