I think that boring oversize generally makes more sense. However, what is it about the structure of the block that makes you think it is of poor quality? Are there occlusions visable to the naked eye? Are there imperfections in the microstructure? Or did the rings just wear big, nasty ridges in the cylinders? If there is a real problem with the microstructure of the block it is possible that sleeving it could make it better, but it definitely goes against the "keep it simple" philosophy.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.