Partyboy, we had this similar issue with a mate's 182, the cam cover bolts were loose and that caused the oil inside the cover flowed into one plug hole, and it was the same, when footing down the gas pedal the car smoked a lot, we undid the manifold to give it a look and for a plug changes and when pulling lead off of piston 4 we noticed the hole was filled of oil, this oil was leaking thru the plug causing lots of smoke, we just redo the bolts and it seems to be ok now (some were that loose you could even hand turn them), however, I would also reseal the cam cover if this were your case. Would be worth a try, my mate also thought it could be rings or something internal, and was just a "detail"
Hope this is you case too.
Cheers!!!