Not firing up!?!?!

I have the same issues going. Mine is a 65' cuda with a 273 V8. I started with battery,plug wires,plugs,cap,rotor,points,condensor,coil,starter,starter relay,voltage regulator and resistor. New resistor started smoking soo that was swapped back to old. After all that i still had rough idle and lack of power. Then went on to the fuel system by rebuilding carb and adding new fuel filter. Still rough idle and little power. I have a new fuel pump to install and hope that helps because if not I have hit a wall. Any advice?

How old is the gas in the car? What is the old fuel pume pressure reading and flow output? No need to replace the pump unless it's out of specification as if it's OK it won't cure anything. You should take these tests if you just where it comes out of the fuel filter so you are checking it as well.

What's the history on the car/engine, have yoyu done anything to it prior to it running bad before you put in all the new parts? Is there any ticking going on with the valve train? Are the valves set correctly? (I believe the older 273's had a mechanical cam which needed the valve lash set) Have you done a compression test recently? What do the spark plug electrodes look like?