I did reach out to Patrick and heard back. A lot of support for his builds it appears.I will have to second using Pro systems. I have a 496 with very close to the same specs as yours. I fought with a 950 HP for a year and finally gave up and call pro systems. Patrick will build you that you will like and you get the best support in the industry.
As for the guys who are asking about EFI or have went to EFI, I am trying to determine if I went that route with a Holley Super Sniper system...whether the 4 Injectors (up to 650 HP) is the route to go, or should I be looking at the 8 injectors setup (Up to 1250 HP) given my current specs?