Unable to get ‘68 904 into Park

I got the transmission back together in Elwood, my 68 Fury II 4 door and I can’t get the transmission into park.
I can get it into all of the other gears.
I suspect that I didn’t insert the parking rod properly.
I have dumped about 6 quarts of transmission fluid in it.
I thought that I got the parking rod inserted, but I must have goobered it and not got it to snap in.

Any suggestions before I drain the fluid and drop the pan?
Author: 3175375