Totally agree with Ian:
A proper tune and smooth running engine first, then chase after any lingering noises. With all of the chains, springs, dampers, and gears in this engine, its a wonder it runs as quiet as it does, even with a proper tune.
Regarding noised pertaining to this clutch:
Notched clutch HUB fingers, consult manual for inspection limits
Broken or weak pressure plate springs
Mal adjusted clutch
Clutch HUB bearing
Worn, warped, or scorched rotors and stators
Improper oil viscosity
Clutch rattle is not normal, I would not be concerned about small rattles.
With the items you mention in your post, you're on the right path to resurrect this barn find.
Good Luck and keep us posted.
Regards.
Todd.