http://vaporworx.com I used the RetroWorx kit and installed a factory 2005 truck fuel pump module into my tank. Now I built a custom tank, but you should be able to add this to a factory tank. They use a Cadillac fuel pump but the tuck one is taller. Check out the build thread in my signature for a few pictures...
PS: there is a specific section for all LSx swap questions.. more info in there ...
http://67-72chevytrucks.com/vboard/f...play.php?f=206