OK, what's the data on the AC nameplate?
Min circ amps? (30.2)
Max OCP??
Unit nameplate data governs the MOCP.
Yes, IF you need 35 amp fuses, then a 60 amp FD is req.
Refer to the "*" under 310.16 to go to 240.4
As to the 'plans', time to request a change order and pull in #8 & change the disco.
John