EFI requires a full 12volts during both cranking and running and Mopar ignition systems are not designed to provide that. So the ignition system has to be re-engineered before you can install EFI.
I think an F-Body ignition switch bolts in, has a circuit that works, but requires replacing the plug and such. But I’ve only toyed with the idea, never done it. Just wondering what you have done.
