First A-833 rebuild, what to look for?

OK got some pics here finally, first is the input shaft and the 4th gear synchro teeth...



Here's the mainshaft with the 3-4 shift collar removed followed by the shift collar itself; I noticed the collar was a bit loose on the hub, watching some YouTube videos by an expert 4-speed builder they should be tighter.




The end of the input shaft is a bit worn as well not sure what needs to be done about this...