The Fujinon C 300/8.5 may not be the best choice for 8x10 due to its small image circle of 380mm (8x10 film diagonal is 325mm).
That's one of the smallest ICs among 300mm lenses. Most are over 400mm. For example:
Fujinon A 300/9 @ 420mm
Nikkor W 300/5.6 @ 420mm
Rodenstock Sironar-N 300/5.6 @ 425mm
Rodenstock Apo-Sironar-W 300/5.6 @ 490mm
OTOH, if your work only requires modest shifts, like landscapes or portraiture, the C might be a good choice due to its small size.