Andy you're a CNC guy as am I. I use a MAZAK Integrex 1850-V 5 axis and have built block fixturing for what can be considered one setup block machining. Still the cam bore and main bores are an issue. Everything will need a lick with a hone to become true round. Horizontal boring is not near as accurate as vertical unless using a piloted arbor. That right angle drive bore head will not be accurate . As you have pointed out a machinist never likes to break setup. Well it still takes a vigilant machinist as CNC's can do wrong. In fact I was chasing tolerances all over until I tracked it down to a worn X-axis ballscrew. It was worn .024" . $30k repair.... It takes a BIG RIGID machine with power to produce (whether it be accuracy or volume or both). J.Rob