Ambassador Opinions and advice

I’m on day two of the leak fix to my 750 Amassador. The gearbox is now on the bench and I’m pretty sure I have the leak nailed down to the breather gasket. I was however very shocked by the state of the clutch. I’m intending to degrease everything change the gaskets and crush washers and do the Jb weld on the welsh cap. What the general opion on the crank seal, as the area around it looks ok I’m tempted to leave as is.
On the gearbox I’m not too sure what to look for, again I looking for advice as what to watch out for. I’ve added a few pic to help as ever any advice or opinions greatly appreciated.
Many thanks Dave