Who are the 408 crate motor builders around?

A friend is looking for a good create 408 engine. Since Mike is gone to other pastures, I am at a lost to where to go and want to take a survey as to what is avaibile in the market place.
I think he is looking for a 408 in the 500 to 550 horsepower range, and most likely put a EFI on it.
Thanks in advance for the replies.
This is a 408 using the new TF head we did a few weeks ago...pump gas, not too raspy...