I have an intake manifold from a 2002 6.0L 2500 HD with a set of Bosche 8.1L 36lbs per/hr injectors installed with a set of LS1 fuel rails from professional products. The LS1 rail mounting brackets have been modified to attach the fuel rails to a truck intake securely. This gives and added feature because the user could cut the fuel rail mounting arms off of the side of the intake and sand them smooth to give the intake a cleaner look so that the rails appear to be suspended by themselves.
The fuel injectors came off of an 06' Avalanche with an 8.1L. They even come with the pigtails. If somebody is familiar with assembling GM weatherpak connectors, they could easily replace their EV1 plugs with the ev6.
I'm asking 200 dollars shipped for the whole thing. By the way, this intake IS a Cathedral port intake.