65 Barracuda daily driver

So the heads are off.

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Most of the exhaust valves are white-ish - no just the bottoms, but also when you look through the exhaust ports.

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I'm assuming that's a cooling passage, but that string of silicone should definitely not be there.

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Also not sure if that's corrosion or if it'll be ok after cleaning it up?! Cylinder walls look good, just dirty on top, no ridge.

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I inspected all the lifters and they look ok. Pistons are .30 over - anyone know what they are? Stock? I think it says something like 0.30-S on them.

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Tomorrow I'm gonna clean up the cylinders/ pistons etc and I hope I can slap on the 675s and maybe even the intake. Any tips on cleaning up the pistons appreciated! Can't wait to drive the car again.