need help with dist. asap

If it's what I think your talking about the gear has a rod that comes out of the bottom and goes into your oil pump the gear is run off the back of the cam and the bottom of your dist. shaft that looks like a flathead screwdriver slips into the top of the gear. Shine a light into the hole and you will see where it goes. This is a smallblock we're talking about right?
I have gotten new "remanned" dist. that I had to file the flat part down just a little so it would fit into the top of the gear.