What fuel tank, pump, and line setup works for an LS swap in a 1972 C10?

Speedway's '67–'72 C10 setup is a good template:

• Tank: an EFI under-bed tank replaces the behind-the-seat tank, frees up cab space and adds rear weight. You can run EFI from the stock in-cab tank with an external high-pressure pump and regulator, but that means modifying a 50-year-old tank never meant to feed EFI.
• Pump: an in-tank pump — cooled by the fuel, with simple feed/return bulkheads. They used a 255 LPH Walbro in a universal module, plenty for a 5.3.
• Filter/regulator: a Corvette-style filter/regulator (filter, regulator and return in one part) for mild engines up to about 450 NA hp. Bigger power or boost needs a dedicated regulator.
• Lines: EFI-rated hose from pump to regulator, routed up in the frame rails and protected from rubbing; hard line for the long run forward.

Size your pump with the fuel system calculator.