Amazing, I built my 416 almost two years ago and still have not run it. Doh!
I put it on the dyno last April though and it made 500 hp and almost 500 ft lbs. of torque over a pretty broad curve. I tend to think it was making a little more than it showed because of the correction factor but who knows. A better intake and a regular volume oil pump would have freed up about 15-20 hp.
I think it will get my car into the low 11s if not the 10s. My car is now lighter than it was before.
It sounds nasty for sure.
