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My first thoughts would be a bad or gummed up oil control ring in that one cylinder. I've seen gummed up rings that had good compression and the vehicle ran fine it simply burned up the oil. In two weeks time the car would use up at least two quarts of oil and the remaining oil would be badly burned and discolored. The inside of the valve cover was covered in carboned up crud. Mind you this was on an engine with about 300K on it but the owner had changed the oil like religion every 3K and used castrol GTX from day one. I know as I did darn near every one of those oil changes. From one oil change to the next it went from spotlessly clean under the valve cover to an absolute sludge bucket. As a last ditch effort I ran two cans of engine flush through it. Change the oil and filter, install one can of motor flush and repeat in 1K. Initially the results were not that good but over a period of a few months the car has quit using oil and is good to go again. Without an engine tear down it is hard to really say what was going on there but I would theorized that the oil control rings were gummed up and causing the problem.
If you have the head off of it you may want to soak the rings down with something to penetrate and dissolve anything like that. Another source for the problem could very well be a leaking valve seal, allowing oil to get into that cylinder. Whatever the cause is it is obviously localized to that cylinder alone.
As far as changing your fuel goes I would run Chevron and be done with it. IF you chose to run something else then I would dump a bottle of techron in it on a regular basis. You need something to keep the injectors clean and you need to change the oil regularly, every 3K.
Why did you pull the head? Are you just going to stuff a head gasket in it or are you going to have a valve job done while it is out. At the very least I would have it hot tanked and stuff in some new valve seals. You will need to get all of the carbon off of the back sides of those valves. We used to have a unit that would blast that stuff off using walnut shells while the head was still on the car. It really worked well for cars that started and stalled in the morning.
Good Luck, Mark
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