I think you want to supercharge this engine, and with the readings as low as .140, you should probably not bore more than .040 over.  I also think you want to bore bigger than that, so it's probably not a good idea.  With the blower, I would strive for .120 wall thickness after boring.  As stated above, you could sleeve the thin ones, but 292 blocks are not too hard to find.  They didn't all have core shift.

John

John - "The Hoosier Hurricane"

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire