lol, the MMM in brushed mode is probably stronger than just about any brushed ESC out there. 120A should cover it. And if you wired in high-power brushed mode, it would theoretically be rated for ~360A.
360 amps..... thats a big brushed motor! i think my old g-12c was rated for around the same current but dont qoute me. i feel a little silly using the mmm its as big as the traxxas motor!