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I have checked up a litle on what "quench" is.
There is something which is still not clear to me.

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It depends on if you're using closed chamber, or open chamber heads. Also most gaskets will say what its' compressed thickness is.

Closed chamber, the head is flat, the piston is flat, stick a 0.040 head gasket between them, boom, you're done. (the valve reliefs allow you to have a sane compression ratio)

Open chamber, put clay on the top of the piston, bolt it together, crank it around, take it apart, measure the clay, machine as necessary, check again (for each cylinder individually)

When I get around to re-doing my 318, I'm throwing away the open chamber heads I have and buying closed ones.