I have a 1971 Challenger with a mild small block, and I was preparing to finish off the fuel system, but I'm not sure which size of fuel line I should use, and if I should add a return line. The engine doesn't have the piece on the cam for a mechanical pump, so I have a low pressure Spectra unit (SP1130, only about 55.7 - 65.0 gph and 4 - 7 psi). Is there any advantage to switching to a 1/2" line, or adding a return with this pump?
