From Dallas Makerspace
AC Delco 40987 GM Part number 6470779.
Inlet line size 9.65mm (3/8 inch ) Hose line to fuel tank hardline. Outlet line size 14.47mm (5/16 inch -24 SAE inverted flare) Hardline connection to carburetor. (Used Dorman part 563963BP to convert to 3/8" hose barb fitting.)