Cam and lifters always as a set mate and always be sus on an unknown fibre cam drive sprocket.
You're talking about your blue motor aren't you?
Black smoke and running worse? What sort of carby is it (should be a Varijet) and have you checked the basics... inlet manifold and carby tight and not sucking air etc? Black smoke and running rough do seem to point to a carby (might get away with running a kit through it and a real close look at the float and choke mechanisms - they also had a gasket between the throttle body and the body of the carby and/or a bakelite insulator under the carby that gave trouble from time to time sucking air), but that rattle you describe makes me wonder if something in the lubrication system (blocked oil filter or worn out oil pump) isn't right if the lifters are all rattling away together at mid to high rpm. Do you have an oil pressure gauge on it - if so what are you getting at idle/1500/3000rpm?
Those 6's had a couple of plastic vac trees that perished and sucked air and they had a hot idle ported vac system that increased the idle if they got a bit too hot (to increse the fan speed to draw more air through the radiator.
Has anyone showed you how to check for vac leaks using either WD40 (be careful) or water?
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