225 Dart chugging past 70...

Yup, definitely a fuel supply problem. Running the car out of gas probably put a bunch of silt in the strainer at the bottom of the fuel pickup pipe.

If you're replacing the tank, the Spectra Premium brand you can get from RockAuto is fine. But perhaps the tank just needs cleaned out and a new strainer installed.

Sender: Chrysler P/N 4051 004
Strainer: GM P/N 5651 705 (NLA from Chrysler)
Gasket: Chrysler P/N 6031 475
Sender grounding clip: Chrysler P/N 2258 862