[mr48chev]

Stock had one line running from the tank to the spot on the frame where the short hose connects from the steel line to the fuel pump.

Depending on what engine you plan to run you have to consider if 5/16 line will handle the volume of fuel you need or if you have to switch to 3/8 line for a performance oriented engine. The outlet on the tank you choose might dictate the diameter of the fuel line too as no matter what size you run it will only flow what the smallest diameter section will flow. I found that out on a 57 Panel with a 327 that I had back in the early 70's. They had put one brass fitting in the line with a tiny orifice that choked the flow to the whole system and caused the float bowls in the carbs to go dry when under hard acceleration.