5.3l LS corvette fuel pressure regulator

[Jfarns03]

For my 5.3l LS engine I need a constant flow of 58psi. Never before have i used a regulator but nows the time to get one. What I don't understand is that i have my fuel line from my pump to motor, then my return line from my motor to the gas tank. With this corvette fuel regulator and filter it has two ports, one for inline fuel and return and one outline port to the motor. Do I mount this in my engine bay and run two return lines? One line coming from this regulator and then another from the motor? Or just splice into the return line? Thanks for the help