I just posted the only pic on my web search able to show the exact location.
My car got the regular metallic stock one which is 5/8"
View attachment 913445
Sorry I meant the flared nut that slides over the tube that screws into the pump
I have a 3/8 fuel filter
Thx
That Is Not The Correct Fuel Pump/Fuel Filter For A Factory 1971 383 Car
https://www.megapartsusa.com/proddetail.asp?prod=129-RPC6806OM
https://www.sstubes.com/collections/all/products/4077
Small Steel Line Will Come Off Your 440 Flared Outlet Fuel Pump - Then Other End For Rubber Hose To Fuel Filter / Fuel Strainer Like In That Nacho Picture
Larger Steel Line Is Designed For Factory Carter AVS Or Edelbrock Carb With Flared Inlet
Other End For Rubber Hose Off Fuel Filter / Fuel Strainer
What Carb You Running ?