Help identifying pistons and cylinder heads

Have this 360 torn down and have a few questions.

Wondering if the pistons are stock, or stock replacements at .030 over. I ask because they all have the stamping "30" on them as pictured. I didnt get a chance to clean up the carbon in the cylinders, but managed to get a 4.02 reading on the one cylinder I measured with cheap digital calipers digging into a good layer of carbon at the top. Could these very well be replacements? They are over .100" in the hole still.

The cylinder heads are...

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Author: admin