Lol, sorry, I had a falling out with the original person who worked on it due to his corner cutting and bloody mindedness through not listening and heeding the advice when working on this one.
So now the cat's coming out of the bag!!
don't tell me this was over the exhaust manifold gaskets 
It was over the:
Fitting an unknown cheap nasty early engine
Non-gen cam cover seals
Not bothering with the manifold gaskets
Badly fitting the gearbox so as to destroy (as was found out later) the torque converter because the advice of fitting it to the box first was not heeded.
Then posting that there crap which was totally due to an incompitent worker who didn't practice what he preached!
The bodges I witnessed on some of the cars he bought was shocking and I could take no more!
Time and time again, as it saved a few quid. Then due to using substandard gaskets complained Omegas were rubbish
Hands up - when I first started tinkering with these cars I thought that all the comments for needing genuine gaskets were a bit OTT and tried pattern ones. Needless to say, I soon learned from the error of my ways after doing a few jobs twice

Having said that, when we did the HG on my current 2.0 all we had at the time was the pattern camcover gasket, so I used it with the intention of getting the GM one fitted ASAP afterwards.
At first I thought the pattern gasket was leaking a bit externally, but I'm not so sure, no oil loss and none in plug wells - and it's done 4k now incl the lakes trip and one to Wigan on a pattern part.
I must say, I suspect it's a time-bomb, waiting to blow

Genuine GM all the way...