First you clean it perfecto, then you run it, stop it and see how it looks.
Seems to me that you need a fill screw gasket, probably clutch cover gasket and probably the drain bolt gasket,
If I were you I’d use 5-20w synthetic motor oil instead of junk F transmission fluid If you are using the stock clutch,
back then didn’t have such a thing it’s way better for your bearings and everything else