1) Not really, best bet is just to flush the crankcase out with solvent and leave it at that.
2) The FA has a rubberized reed body, if it's deteriorated, then replace it. If it looks fine, than leave it. You can always clean the area and use a very light coating of non-hardening aviation sealant to ensure a good seal.
3) Loc-Tite is the obvious answer and should be fine.
I mean no offense by this, but given the questions asked I would suggest you do not split the cases on the FA. There are quite a few moving parts in that transmission that will be a headache for someone not used to working on them. I would suggest getting everything back together on the intake side, and working from there.