65 904 parts hunt

I ran into the same think with my 67 904. I didn't find anyone that sells a new high stall converter for 67 and earlier trans, but there are a few companies that will cut apart you stock converter and make it a higher stall. I have never done this so I don't know if it work's well or not, maybe someone else here knows.
I ended up replacing the input shaft to a later 904 to get a new converter to work.
the input spline was changed in 68, so 67 and earlier are the same, and 68 and later are the same.