I am trying to do a similar project, but I have a complete panel.
You can see the pictures in my signature but the modernization of at least the suspension led me to a link on another thread. I have not tried this but it will probably be my summer project.

click here

Again I have yet to try it but their description is pretty detailed


1957 Chevy 3800 Panel Truck - "Nightmare"
(Nightmare to restore)
Will give nightmares to the Fathers of my girlfriends.
"I'm in artillery!" Thank you, Bob. Can we play anything for you? "Anything! Just play it loud, OK?!"