Just cut the chain, you may have to replace it anyway.
Then deal with the pins on the bench.
Fix the head gasket and put your diesel back together before you take the next one to bits.
It doesn't work out having too many projects.
Believe me, i am talking from experience.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.