It sounds to me like you are missing some documentation somewhere. What is the actual part number of the complete system you bought.
Here is one version of the support page:
Tech Resources
Fuel pump layout page 11 of this
https://documents.holley.com/techlibrary_199r11031r-1.pdf
Also, I have not been there in awhile, but the Holley support forum is very good. Danny Cabrel is just incredibly patient ant helpful. I don't know WTF Holley is gonna do when he decides to "do something else"
Holley EFI