I found oil coming out of the hub on the front of the transmission and the side plate. I found a brittle gasket and no gasket at all. A quick trip to Napa was disappointing as the guy behind the counter said they don't carry gasket sets for manual transmissions, only automatics. Go figure. So I bought a set of gasket paper and made my own.
I freshened up the clutch fork with a little sand blasting followed by paint.
A 1963 clutch fork uses a push rod to fork configuration much like a push rod to rocker arm, basically a ball and half of a socket. In 1964 the clutch fork was changed to a pinned configuration as shown below. I decided to install the 1964 configuration simply because it looks like it would be less likely to fail. I might change my mind later but for now this is what we will use.