AD's and service bulletins for the R22 and looking for the valve
guide to valve stem clearance test to start with. I can't remember if
it was SB or AD
It's a service bulletin. Go to the Lycoming site and they will have it there
for a free download, however, I don't think that's the problem. I seen many
Lycs that didn't pass the wobble test and none of them smoked (just siezed
valves and bent pushrods).
You also need to buy an expensive tool to check the wobble.

I would crank the engine (after it has set at least overnight) as if you were
going to start it, leave the mixture lean, then I would pull the plugs and see
which cylinder is the offender by looking for oil fouled plugs.

If you have a worn valve guide you can usually see it. The excessive clearance
between the stem and guide doesn't allow the valve to cool enough and it
generally cooks the oil around the spring and keepers on the exhaust valve.
Don't compare intake to exhaust visually. The intake runs a whole bunch cooler.
Compare cylinder to cylinder, exhaust to exhaust