I got $10 on the tubes. Never seen a head gasket leak oil. And if I wasn't on my phone I could easily get you links of where and what to read. Go to
www.slantsix.org and choose articles then engine and read through the stickies in the engine section cause I believe dan has a full write up in there.
I tried my best to explain but I've only done it twice and it's been three years or more since last lol!