The overbore situation doesn't bother me. When I was restoring my 66 GTO in 2005, the original 389 was already .060 over (from my 1980 rebuild) At this point in 2005 4 cylinders were pitted badly from the engine sitting for 20 years in the car. It was a no brainer to have them sleeved and bored to .060 to match the others. In retrospect, and considering the minor cost of sleeving compared to the cost of restoration, I should have probably sleeved all cylinders and went to standard bore.
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