I'm not a machinist...but I know a really good one.
If the old bearings are undisturbed, I'd start by inspecting them. As alluded to in a few previous posts, looking for unusual wear is a great first start. If any bearings show uneven wear (one side worn more than the opposite side), that's a strong clue that you would benefit from a GOOD line hone.
I'd rank your options for a great engine in this order:
1) line hone by an excellent machinist. Ask Mike (mgarblik) to describe the extra steps required to get them really straight with no taper.
2) do nothing
3) line hone by a sub-standard machinist. It's easy for an idiot to make things worse.
Eric
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