Although I have never worked on an 8N, I have removed lots of pilot bearings from many different makes & types of vehicles. Easiest way to do it is to fill the pilot bearing socket & bearing with Grease, then take a about a 6" length of wood doweling that is just a slip fit in the bearing, place it on top of the Grease & smack the dowel with a hammer. The Grease won't compress but has to go somewhere so it forces the bearing out of it's socket.
Since you stated that the clutch disc was frozen to the flywheel; as long as you have it apart, remove the flywheel & have it machined flat and smooth, and put in NEW pilot bushing and throw-out bearing, and as WW2N said - use only American made parts. Don't cut corners, do the job right the FIRST time.