It will cover 8x10 with some - not a lot- of movement. The specified coverage of Angulons, like their close relative the Dagor, is open to interpretation. An IC of 480mm is probably extremely optimistic, but may work out for contact prints. Your best bet is to try it out. I'd test both of your examples; there is an innermost element of each cell that is supported by the balsam only and if the lens has been stored on it's side in a warm environment for an extended period of time it's possible for this element to shift.