I hate to say it, but I believe that's a problem. I've heard the early engines can be prone to that damage.
My thoughts.
Yeah well neither the small end nor the cam looks "Mint " so to speak .
The small end can even be at the latter stages of life.
But again what can look mint on a 50 year old motorcycle.?
Thinking out loud here . The cam a bit worn . Rockers a bit sloppy .at all ends.
Cam chain taken a beating ..moving the synchronization a bit between crank and cam .
Valve lash a the tight end .. Perhaps not set at the perfect spot
All in all a solution appears to be there in having a little more valve play.
Nothing blue and nothing really pitted can be seen or metal transfer from surfaces
No problems with the ride. Recently.
Option 1 Tear it down .. in my view to soon and costly ..
All in all this is a running bike with a minor problem after standstill
Option 2 Accept it as it is .. I would do something like look for a better cam ..replace wrist pins
check valve seats if not certain compression tests are " perfect "
Check lubrication and pump Using better oils and change more often.
.And perhaps forgot something here .. And ride some more.
Me coming from "C*ap " bikes are used to do such compromises. I do know others have other preferences and don't want it other than perfect.
But if aiming having a mint 50 year old bike ..And ride with it .. is costly and time consuming and unless being a competent mechanic
The risk is there having no bike at all.
All in all a solution appears to be there in having a little more valve play.
Here is summer coming up A tear down would mean no riding Less than perfect..