There's a crack
Yesterday, after reading elsewhere about where cracks typically occur on that block, I looked again with a strong light. With my head nearly into the bilge, and looking up under the manifold, I saw a lengthy crack, with rust on it and some running down.
I guess two questions not resolved are whether that crack could be "repaired" and if there is any internal damage. I may put a bucket under the outdrive, or use muffs, and run the engine. I don't know if that would be definitive.
Otherwise options are long block with more labor for switching parts or new complete engine, at more cost but less labor (but more overall cost).
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