By the way have the same problem with a bush being too tight in one place, so I assumed it's not in line with a ball bearing. Thought about scrubbing a tight spot CBS way but seriously afraid the clearance will be too big for a proper oil pressure. Took the block to the machinist again to install original type of a bush ( steel with bronze insert pegged together ). However until now it is not done yet. I was looking for possible tools to do a line boring and found a film about a Harley pinion cutter:https://www.facebook.com/charley.dawidson.9/videos/1118128241966317
This tool is shown in 1.30 min and looks like could help with fine honing of the bush.