Compression and PCV are not related. If the PCV is clogged, it can cause increased oil consumption as part of the system is designed to reclaim oil vapors and return them to the sump when they are condensed back into liquid.

Your NA engine should have a screen in the flame trap, toss it. Then clean the parts and put it back together. Cleaning the small diameter vacuum line that goes to cyl #1 is tough, the condensed oil tends to turn into very hard crystals and is almost impossible to remove. It is easier to buy a 3 ft section and replace it.

If you remove the intake manifold, replacing the gasket is suggested. Any leaks will cause the engine to run rich. If the gasket comes off clean and you think you can reuse it, give it a try. Remember the torque is about 14 pounds on the 10mm nuts.

So long as you are not getting any misfire codes, your compression is OK. Not great, just OK. If you start to see oil smoke coming out of the rear of the car at traffic lights and long down hills, it just might be the valve stem seals that allow oil to be pushed pass them and cause the smoke during high vacuum conditions. Replacing the seals is a LOT of work.
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