Removing 340 heads

Bad Sport said

If you did the compression test properly and got those numbers, I don't see a reason to disturb them.

My bet is the valve cover gaskets and perhaps the intake gasket. I can just about tell you those cork gaskets on the VC's are dry and hard.

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I already replaced the VC gaskets and they still leaked a little and I had some room to tighten them down but the intake gaskets were almost dissolved by the time I removed the intake.

I have some original cork. Any suggestions on what would be better?