Yup on the Mustang, except I'd run a stroker kit at 501 cubes, solid lifter cam with either some D0VE, D1VE, or if you got some extra bucks a set of Aluminum heads. Because they are light, a mildly built C-6 will work fine. Forget the trans brake and resultant parts breakage. Just get a converter to flash at about 2400 and drive off it. Shift at 6200, they're done making power by then