On theManuals I like the factory books the best. The Clymer and Haynes are about the same. Some like one better than the other.
As far as the pics, the springs are in place the adjustment looks ok.
At this point I might try pulling the left cover. If the shift shaft got bent it can bind abit where it goes through the left cover. If it appears to be bent. If you can figure out which way, a length of pipe on the shaft, you might be able to bend it back.
You say you had the engine out a few times already. I assume you rebuilt it. During the rebuild, did you split the cases? Did you do anything to the shifter parts inside the case?
It's possible that if you had the tranny out you may have put something back together wrong. Possibly a shift fork not in the right place. Beside the groove instead of in the groove.