I never had any intention of running them completely out of the box without a thorough cleaning and inspection by at least me if not better. At this point I'm considering a machinist straight edge and my own dial gauge...
I'm all for the straight edge, but a real bore gauge (like a Sunnen) for valve guides is pretty spendy. I've seen some of the cheaper bore gauges get down to about 1 inch or maybe a bit less, but I've not seen a bore gauge go down to .375 or .342 that wasn't criminal expensive.