It’s very kool
hearing about your new mission. I think you can handle it. I don’t know the true condition of my engine so I would investigate it closely first. I use a very bright light and take good inspections while reading the manual.
From my days on domestics, if chain is changed so are the sprockets. However, while working on the SL I notice a tight fit on internals. I’ve read many post on changing chain w/o sprockets. Inspect closely…
I would use the woodruff key to correct stretch. It’s in the manual for this reason.
The biggest thing is you have that ear for the engine. You notice those small sounds that give you time to investigate and make advance purchases. Thumbs up