you should see how big they are on my engine atm
you cant go this big with a z22se head
the inlet manifold is match to the supercharger manifold on the saab head
its overall stronger than the z22se head ""out the box""
exhaust cam is full lenth not cut like the z22se
there's more tolerance on the saab head being sand cast thicker in places than the z22se
better plugs imo no risk to crack the head
and no egr system to worry about
you would have to sort something out with the rocker cover do as i have done and mod a coil pack