Sunk liners aren't really reliably fixed, elastomer is recommended for low liners but none are guaranteed to fix sunk liners because the reason they are sunk is because the block has gone soft and is normally scrap.
Head is also questionable if engine has got hot enough to undo the heat treatment on the block.
You can try elastomer gasket, but you may find yourself redoing the same job repeatedly.
More reliable fix would be to source another block or engine if head is also soft... May work out less hassle and cheaper in long run.
You must of had a serious overheat to soften the block.
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