Bad knocking under feet

That plug on RHS looks suspect. Instead of jumping it out you can buy a cheap one. If it isn't the issue keep it in the glovebox as they do sometimes fail on a Rainey day.
1974 DODGE DART 5.2L 318cid V8 Ballast Resistor | RockAuto

waiting on new ballast. Last night I put on new plug wires, dist. Cap, rotor, and coil.

getting new ballast today.image.jpgimage.jpgimage.jpg