Thanks for the info HRL
I had already went to lowes and got the 3/16 pin
Hopefully I can get this old distributor to work temporally so I can get the 50 started and continue my troubleshooting in the garage.
Fortunately wetwill5757 made me a generous offer. Thank you
So here's the old distributor with the pin installed. The drive gear is not loose anymore.
...pic... I do have some up and down slop
Is this acceptable?
...video... 
