5.0L injector rail plumbing

I am not familure with Fords way of doing their fuel system so here I am asking. I am installing a 5.0L in a 1966 Mustang but cannot find any information as to which injector rail connection is the feed and which is the return. There is one connection at the front that I assume is the pressure inlet and then the one midways back near the regulator is the return. Is this correct? I would appreciate any information.