I had the 6AL on my 460 powered F250 with a 6700 pill in it. Worked great even after many many mud baths.
Had the 6M2 in my boat. Also worked flawlessly aside from the obvious lack of a rev limiter. It even survived a bunch of Mexican kids flinging mud ALL over my boat while we were at the camp ground, for those of you who know Buena Vista, that mud is disgusting.