?Respectfully Request explanation of how/what this kit rod b engine fuel pump works/does?

You're welcome!
Thank you so much! After the home invasion & divorce, I have been sorting through all the Mopar I purchased while in the Navy. The perp hid in the garage, the police looked for him, too many stacked boxes around the project car-they never found him. You needed a hover board or a leprechaun to navigate the garage. That is what it took to get out of the funk and working back into the hobby. I bought a few of those assemble-metal-shelves from sam's club and walmart and invested 50 hours into rediscovering old treasure and organizing it. I bought this fuel pump kit long ago for the 1974 C-body police 400 I journeyed to Michigan for in 2006. Rusty and IQ52's BBM builds rekindled my interest after school has been overwhelming. There's gonna be more questions so thank you very much!