I have an 04 5.3L assembly in house. There are some things about the assembly that would make our pumps not drop-in fitment. Our universal kit will come with most of the parts required to do the install. You would have to source a hose outside of the DW universal kit to connect the outlet of the pump and the inlet of the assembly.
We do have a fuel pump installation service available that I can extend to that platform using our DW200 or DW300 fuel pumps.
The service is $69 and includes ground shipping back to you. We will need your fuel pump assembly sent in and will require 2-3 business days for the installation.
Let me know.