And so it begins,,,,,, 5-speed Duster swap!

Well, I’m thinking my luck is a little worse than yours. What I thought was a leaking freeze looks like a hairline crack in the block right above the freeze plug! Looks like I’m back to square one!

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Dang, that sucks...

Seeing as it is a real 340 block, it might be worth seeing if it can be welded.
https://www.hotrod.com/how-to/engine-block-repair
Or you can try the pinning: