Hi Scott,
I have a 461SBF and i am very happy with the engine. It's not from Bill Mitchell, but i did speak with them about their 460 on more then one occasion. They went out of their way to answer questions, and gave me detailed data on the engine even knowing ahead of time that i was not buying, but seeking information. I believe the dyno sheets averaged around 618 and 585TQ ( I may be off a little its been a year or so).
