Kb399 questions

I am trying to understand the kb399 specs so my machining instructions are clear.

The uem page says that they will be .010” above a 9.578” deck. It says they are -6.2cc or .200 dome. They are 1.81” compression height.

So my 69 la318 is supposed to be 9.599”-9.6” deck height.

So is the -6.2 cc depending on the piston being .010 above deck? Do I tell the machinist to “zero” the deck or bring the deck to 9.578 so the .01 above deck gives me the SCR I am calculating with the calculators?

Thanks again for the help.