Father-Son 1974 Duster Project

Depending on the sending unit size I would just buy a new pre-bent stainless steel lines from a vendor, Classic, Mancini etc. Stock size is 5/16.
If you are replacing the sending unit upgrade to 3/8 and put a bigger line in, the cost is the about the same.

No return is needed, but you will have to vent the tank on the other smaller line.
Factory ran small line up to a charcoal canister in the engine compartment.

Carter makes a muscle car series mechanical pump that is really reasonable.

http://www.summitracing.com/parts/crt-m6866/overview/make/dodge