Lay a straight edge across ther bell housing and see how much the shaft enters the pilot. Make some measurements on the block side laying the straigt edge accross the flywheel and see if they match.
Also if the pilot bearing is brass you should see some marks where you have been possibily a little mis-alligned. Done this many times and they are tight. I have used my feet stomping on the tail shaft many times to get them to go. I big bucket of 4 letter words helps too! ;-)
Clyde
