340 Dart - Fuel Filter location

IMO- All 340's had the filter after the pump and before the carb. It was laid at an angle above the intake manifold (exit end up slightly). If you decide to also put one before the pump make sure that it's easy to get to. You will be replacing the rubber hose ends due to cracking which is my experience and if you're not mindful of this it's a fire waiting to happen. This is all considering that you're not using AN fittings to connect everything.