i need a little 340 help. Lets Talk head gaskets

I know this not what you want to hear but here goes. The block deck looks terrible. I would believe a composite gaskets would have a hard time sealing . I couldn't see a multi layer sealing.

What you need to do is take the pistons out and get new pistons and have the block square decked. You will have to get it balanced also. What you are working with is a breed of many parts that don't go together. And those pistons look to be from the stone age,

A block when the machining is done right should look like this for a multi-layer gasket.

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