Clean 12v switched source that is hot cranking and running

DionR said

What about a different ignition switch?

Didn’t the F-Body do away with ballast resistor when they had lean burn?

If so, maybe the circuit in the switch is different and run doesn’t go dead when in start. Maybe that switch is similar enough it could be swapped in?

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Latest book I have is 76. All diagrams are similar, and all ignition switches seem similar, all are labled with J2 circuit, dark blue. I don't know about later ones. Other than a junkyard, and physically comparing switches, that seems like a really long shot.