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if you have 10 good cylinders and 2 really bad cylinders I would look for broken rings and burnt valves. Another possibility is you have crud on the seats of those two cylinders.
I did a leak down on my 76 911 and cylinders 1-5 were good, around 5% leak down. Cylinder 6 was weak with a 25% leak down. I was expecting to have to pull the motor and do a top end at the least but I've decided to do a Italian Tune up on it when I get it running again. Its been on jackstands for a decade. The last time I had it registered it passed smog in California.
I moved to Arizona two years ago so I have time to work on the car and since its been sitting for so long I'm going to go thru everything and get it back to being a reliable car.
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