60 mph mamba brushless setup for e-maxx, would this work?

OK, I don't remember. Have you ever built a brushless monster truck before? I'm just asking, because you seem to be very pre occupied with speed. Of course, most of us go through that stage, but it comes when you get to a point where you have gained some experience.

If this is your first conversion, I think that you should be looking for a solid setup that will turn on and roll when you want it too. I'd go with a MM and a 9XL. A nice conservative setup that will surprise you with its speed when geared right.