I am rebuilding a 289 from my 65 fastback and I have a part I can not remember what it is.
It seems to fit the crankshaft.
It is a thin metal round plate recessed and has a  notch to fit the crangshaft key. Seems to fit around the harmonic balancer. Does this part go after the crank gear before the timing cover is on or with the harmonic balancer?
I'm sure I will figure this out, but i wanted to see if anyone else used this on their rebuild or know what its purpose is?
See picture.

Thanks

Mike B  

Commonly called an "Oil Slinger". Helps to keep
oil off the damper seal, and prevent leaks. New
engines don't have it. Most people trash theirs during
a rebuild.

You could probably get one at the dealer.

The trick to preventing a leak there is to install
the front cover so it's square to the crank snout and
not the block.
Install the gaskets, and the bolts hand tight.
Slid the damper on so the hub just barely enters the
seal. Move thr front cover around until you have even
seal compression around the circumfrence.  

Yes, it's the oil slinger.  I goes on the crank after the crank gear goes on, behind the timing cover.