It would be a LOT smarter and less expensive to sleeve the pitted cylinders and re-use the pistons you have already. A 3/32" wall sleeve won't require much more machining, and it's likely that the metal in the sleeves will be better quality than the original block material. I've run small block V8's with all eight cylinders sleeved back to standard bore, after competitors on the race track were ready to discard a "worn out" 60 over engine. After they started getting beat by their own junk, it got hard to scavenge anything, though!
Jerry
