1966 Driveshaft - Which End is Front?

There is something wrong there. The specs call for the Snap rings to be on the outside of the joints. See the "Snap ring type" below.

The u-joints I took out also had the snap rings on the inside. I don't remember them sticking out that much though.

The caps did press in a good ways so I think I have plenty of bearing surface. And the snap rings just fit when the caps were pressed all the way in.