Edelbrock heads on a 340 with KB243 pistons

According to Fel-Pro the manufactured thickness is .046 - .057. That is uncontrolled manufacturing of the material and you don't know what you have till you buy it and measure it! Then you take off .005 for compressing when bolted together.
I just went through this on a big block I built over the summer, got Cometic .060 stainless gaskets, no crush, no retorque,
and gave me .040 quench.