Presumably if I adjusted the lever slightly it should ensure I have a bit of in/out adjustment at the adjuster.
I'd say thats about spot on.
Just make sure it still has enough travel to do the job.
If the cable is out to the limit, there may not be room to lose any travel.
And it needs a trace of free play, so the clutch won't be inclined to slip.
Getting cable lengths precisely right is quite a fine art, I've resorted to snipping away bits of the outer,
if it has surplus length and you need more inner length to get some adjustment.
Pics worked ! Nice old thumper, looks to be in fine form.
Am I right in thinking you may not have the decompressor (valve lifter) components,
there looks to be a fitting between the valve lifters/pushrods for it ??