Cylinder boring question

I did use feeler gauges to get a guestimate on how deep the groove is. I had to work all weekend, so I hadn't been able to tear it down and take to machine shop. I will be able to do that this week and see what they say. I do believe a sleeve is the best solution. I hate to bore the snot out of an otherwise good block that most likely not need to be bored.
Thanks for all the great information!