Semi related; my engine guy said 2nd over bores were cake but boring for the 706 pistons in stock liners was tricky, the boring bar produced enough flex in the unsupported lower liner that he had to take thin cuts to end up with a round bore down there. Even with a torque plate, the unsupported section of the liner may be a limiting factor on "roundness".
PS I'm not Gary the "Hooser"
PS I'm not Gary the "Hooser"