[nuz69]

The power you consume doesnt depend of your motor, but of your application. Put a 1527 in a 1/10 scale vehicle, it will consume less than 30 amps continous (geared for standard speed).
If you use the 1527 at its maximum power, of course it will be a little too much for the MMv3, but using the 1527 at its max mean geared your truck for 90-100mph for example.
Geared for the same speed, a 1520/1Y or a 1527/1Y will consume exactly the same amount of current, the 1527/1Y will consume even less because little more efficient.
The 120 amps of the mamba motor is the max current the motor can consume, but in fact it never consume that current continuous. See the point too, that a 1515/1Y or a 1512/1Y or a 1520/1Y is given for the same max current, that's because the 3 motors have the same widing configuration (wires thickness and Y widings) so you can imagine that a 1527/1Y would have been the same ;)