As shown in the post above the filter was in the rubber line between the engine end of the metal fuel line and the nipple on the fuel pump. The filter in the photo is farther forward than the original - a smart move with the forward header pipe closer than the cast manifold and rear facing exhaust pipe. It's how every V8 70 Dart came from the factory (don't know about /6 cars). The original filter was a plastic case see through style (I think for initial diagnostics), which was then replaced at the dealership with a metal case one.
