My car is beginning to oil smoke on long downgrades. Valve job was done in 2013 and car not driven much since. Tested my compression today for the first time since before the valve job. Here are the results, starting with #1 cylinder at the front of the engine: 145,110,85 (the cylinder with the broken valve spring in 2013), 126,124 and 143 (with a wet plug). With the exception of #6, all plugs were dry, brownish gray to light black and all had held their .025 gap. In 2012, the readings were 170,162,165,155,155 and 165. In 2013, just before the valve job, the readings were 125,120,0,115,100 and 125. The valve job definitely helped but now 4 cylinders are below par. I injected some oil into #3 and the compression went up to 155 so the rings are undoubtedly shot.I probably should have replaced the rings when the head was off...but didn't. Car has about 104K miles and thrust washers were replaced in 2012 but all bearings are original and there is about 65-70 lbs. of oil pressure when cruising. I use 20W-50 oil. It was down a quart. Now my question is this - how long should I run this before replacing the rings? How about the rods and mains? Replace or leave alone? Bear in mind I will have to farm this work out as my local TR6 expert may have retired. Except for the oil smoke, the engine runs perfectly and pulls strongly. What else might need replacing? What would you do?