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I have C7RA ali heads. I had them faced, one needed more than the other.
I have Ross pistons. Without gaskets they lifted the heads when I turned the motor over.
I mentioned it on this forum. Another kiwi on here told me to measure the lift with a dial gauge on each cylinder, which I did. I wrote each measurement in each chamber and sent my heads to Brian. Brian had previously built a jig and made a tool to cut the heads to suit the Ross domes. I am lucky and grateful for his help. One head needed on average about 0.040" thou out, and the other about 0.022" out. The heads are on, but as yet the engine is not yet finished.
I have used Best composite gaskets which I am told settle out at about 0.055".