All Classified forums require a Site Supporter subscription. It is only $25 per year and you can buy and sell whatever you like on the forum. To become a Site Supporter, go to Your Profile and select "Paid Subscriptions."
Early LS engines have a pressure regulator on the rail, usually the LH rail and a return line back to the tank. There is the Corvette version that has the fuel pressure regulator built into the fuel filter, with a return line, and then the later model ones have a fuel pump module in the tank with the return directly in the tank and no return line.