I tore my distributor apart to change the pickup coil.
On the base there is the gear, and an inch or so there is a ring that
gets a roll pin (looks like a donut with a ridge on it.)
Putting it back together, I am not sure if that ridge does to the
bottom of the distribitor housing, or the narrow end goes up.  Does
anyone have a dist. handy to look at?  This is for a 1979 400 engine.
Goes in a F150 pickup truck.  (In other words, that round device is
wider on one side than the other.  Does the wide side, or the narrow
side face toward the bottom of the main distributor housing?)

Thanks

Mark