So far all, the plumbing sounds correct.
However, that hose in the middle of the intake manifold isnt the PCV hose.
It's for the evaporative emissions system.

The PCV - or positive crankcase ventilation - fitting is cast into the cylinder head cover (just above the D in DOHC when looking at the engine from the exhaust side).

The PCV hose needs a check valve oriented so that intake vacuum will draw the oil-laden air out of the top of the cylinder head and into the intake ducting. On the OEM intake, there is a fitting for the PCV hose a few centimeters before the clamp end that fits the throttle body.

If the check valve isn't oriented correctly, pressure will build up and drive oil past the valve seals with continued high rpm use. The classic indicator of failed valve seals is a large plume of blue-grey smoke on startup, especially after the car has sat for a few hours.

But since the engine has been sitting for nearly a year, I would suspect the spark plug tube seals first. I recently had to replace mine when I noticed my fuel economy plummeting and a lot of soot collecting on the exhaust.

Turns out that oil had crept out from under the valve cover at the base of the plug and had begun to foul the electrodes ond cylinders 2 & 4.

Apologies for the novel; hopefully some of this will be of use. h: