[jwasbury]

Mike,

For starters, why not just jack her up and clean the head to cylinder interfaces from the bottom. Then take her for a spirited drive with plenty of boosting for an hour or so, then jack it up and look closely at the interface area. I think you'd bee able to see discoloration if you've got a lot of leaking compression there.

Just to be clear...you wouldn't be leaking oil from between the head and cylinder, you'd be leaking compression and combustion gasses. Oil leaks would be from the rocker arm shafts, valve covers (or both), or from somewhere else.