The sleeve arrived in yesterday's mail, and it looks pretty promising. It has a wall thickness of just about 1/16", which would require the 235 cylinder to be bored out approximately 3/8" to install it. I'm not sure if that would leave any of the original cylinder walls intact, but I've been successful with similar modifications on engines that get a lot more abuse than the average stovebolt engine. For the cost of one sleeve and a little machining time on an otherwise junk block, it's definitely worth a try. The Ebay vendor's ad says "more than 10 available" so the sleeve is not some kind of exotic, expensive part that's going to disappear any time soon!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!