Oil leak issue?

Engine is LD9 (VIN 8th digit "T"). I have cleaned and re-installed the air/oil separator and cleared PCV hose blockage. It now looks like the valve cover gasket is also leaking badly. Once warmed up, it can lose a quart of oil in 25 miles. I understand this is fairly common. I have new gasket, and a new timing chain set with guides. I have read that one has to remove some of the overhead cam assembly and timing chain to replace this gasket.

What I am looking for is a link to a step-by-step guide for doing this task. I have the means and skill to do this, I just want to know the correct procedure and I am having difficulty finding this. Everything I find is for 2.2L I hear it's kind of a long process and I don't want to do anything I don't have to.

Don't let the mileage fool you. I bought this Z24 at auction and, from what I can tell, it has maybe 40,000 since the engine was rebuilt. It seems to me that the rebuilder didn't replace some of the peripherals, like PCV hoses, radiator hoses - that kind of stuff. (No sludge in engine, just in the hoses.)

This site is the best and not run by a bunch of greedy people like so many others. Great Job!