273 Engine Help

Hello everybody,

I have a 68 Dart 273 engine with 48,000 original miles on it. In the past few months it has been bogging down when stepping on the accelerator, and then it will stall. This only happens when the car gets warm. It then is very hard to start and when it does it idles very rough. I can not seem to figure out what is wrong with it, I have done many things to try to solve the problem with no avail. Here is what I have done so far.

1- New fuel lines, fuel pump, fuel filter, rebuilt carburetor.
2- New spark plugs, spark plug wires, new coil.
3- All new hoses.
4- Timed to 8 before, ( has Pertronix electronic ignition )

Do you think the Pertronix ignition has gone bad??? Do they ever go bad??

Any help would be greatly appriatiated. :???: