What was the end result after the trip to the machine shop? If they line bored it, they may have had room to tighten up the main bores a bit, reducing the total clearance on any set of bearings you try. There is a spec for loose to tight, and tight (on the bearing bores, not clearance!) is better for better holding power so the bearings don't spin.
Spec for the main saddle bores is 2.9425 to 2.9430. If your block was at the high side, you can reduce bearing clearance by .0005 by tightening it up to the low side when line boring.
If the block required a fair amount of work to get to spec, the crank to cam distance can change also, requiring a shorter timing chain set. They come in .005 under, and .010 undersizes.