Thoughts on Fuel Line Size

Go 3/8" or -6 all the way. When I did my Duster, my buddy bent up a new 3/8" hardline from tank to pump, then I went black -6 braided pump to carb with an Earls inline filter.

Also, just watch for your fuel pump inlet/outlet size too. Alot of the stock type replacement pumps are 1/4" NPT! I upgraded to an Edelbrock mech pump that's 3/8" NPT in and out so it's true 3/8" (or -6) the whole way front to back and back to front. As well check your sending unit! If original it's probably 5/16", you can get 3/8" replacements nowadays, which is what I did as well. Figure this way I'm covered for 99% of my engine power goals.

Ditch the 5/16" stuff, it's probably not in so good a shape anyway.