Nothing wrong with boring the block beyond .080" as long as you sonic check it and have adequate wall thickness. Having to sleeve all 6 cylinder plus a line bore expense is an awful lot to sink into a block. There has been 261's for sale in the classified section recently, so you look to that as an alternative. Since this block is already .080", the shop could bore into the water jacket when boring to install a few sleeves. The sleeve is only as strong as the metal supporting it from behind. And if you expose the water jacket behind the sleeve, it can lead to other problems. Boring it to .100" or even .125" over as long as the cylinders are thick enough is better than re-sleeving with the water jacket exposed to support the sleeve.
