**not a nec expert, I am Canadian**
It appears that the NEC says that motor will have 40 amps FLA.
125% of 40 amps is 50 amps, so you need minimum of 50 amps.
I *think* you can put it on a 60, but I'm not a NEC expert. If you're Canadian, then I can help more.
Of course, I'd be inclined to...