I have the Holley EFI Terminator 4bbl setup on my vortec headed 383 SBC and I love it. I'll echo what everyone above said, work with Carl on the fuel system needs and work with Andrew on the tuning.
Personally, if I was doing it over again...I'd use this intake which was NOT available when I did mine.
But I'm still pretty happy with my throttle body injection setup.