Wondering what acceptable deck height variance is after machine work is done?

505" stroker and the variance is .004 between lowest and highest. Good or no good??
Another question, I have the icon 842 inverted dome pistons, eagle crank and 7.1 scat Rods- pistons in the hole .010-.014 with 440 source heads- Question is what Head gasket thickness recommendation?
I'm guessing use the .027 or .030?

Thanks