the 'saab / lsj / z20net' cylinder head has an extra ancillary drive fitted to the exhaust cam. The z22se exhaust camshaft is shorter so unless you use 'saab / lsj / z20net' cams you need to blank off two oilways.
the first is for the cam bearing and the second is an oil feed for the exhaust cam driven ancillary.
I had several ideas to blank these off but decided on a simple method, drill and tap M10x1.5 and fit a matching grubscrew with some threadlocker.
These are the two oilways circled in red, I have already drilled and tapped them
tip: to open up the oblong cam bearing oilway I started with a 4mm drill bit and then increased the hole size in steps of 0.5mm until I reached the required size for the tap.