Hardlines down the chassis with flexible teflon lined lies at each end is my preferred setup. One or two lines depends on how you are regulating the fuel pressure, and location of the regulator. I have in-tank pumps with a Vaporworx controller that bypasses at the tank, so only one feed line needed to the front. If the pressure regulator is up front on the rails for example, you'd need to add a return line to the tank. Many people use the factory 3/8" hardline that was used for the carb as a return line.
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