It's your call whether to replace them or not. As I said, I'm not sure just how much if any of them might be normally visible.
If you do replace them, be sure to get all of the old ones and anything else cleaned out of the groove where they rest. The inside of that groove is rough (rougher than you would think for something they put so much emphasis on having clean) but it sounds like you're doing a through job of cleaning out the motor. A pick, a strong light and a mirror to slip into the hole to chekck things out would be in order.
Arguing against changing them out are a) the assumption that they are not leaking, b) it may be they look completely normal, and c) if the bores of the sleeves are out of round any, you might have more problems if you put the sleeves back with the egg oriented differently. If you want to replace them anyway while you are in there (not a bad idea), C can be overcome by scoring a light index mark for each sleeve in the top edge of the sleeve and onto the top of the block so that they are lined up as they were if you reuse them.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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