You really can't tell cause Acura/Honda engines are built with such great precision and they are built for a long life.
If you want, you can do a valve adjustment, and a timing belt and water for any type of real maintenance (overhaul) to your engine.
Also it really depends on what type of overhaul your looking to due! If you want to replace your bearings you should get the crank balanced, and micro-polished. Re-hone the cylinders for blow-by proposes with the install of new rings (new over sized pistons if need).
Up top someone side something about just changing the spark plug ring only and not getting the whole valve cover set, I know when you take off the valve cover you should change all gaskets as a set. You will be at a low risk for any other leaks (the right way)!