You haven't supplied enough info, there are too many variables involved, really can't just look up a couple of spec sheets and get a good answer.

What RC is it for, and how are you intending to use it? (weight of RC, drive type/traction, gearing, battery voltage, intended use, etc determine how hard the motor will work, and thus the amperage it will need)

And what ESC? (there may be info you haven't found, and/or experience as a guide)

Really the only way to do it without more info to compare to collective experience is to buy a data logging system or wattmeter and experiment. But provide some more info and we should be able to come up with a decent estimate.