The heater box photo you posted looks like the A pillar isn't rusted
Looks like its just the flange that is rotted out.
You need to remove the heater box which is no small feat if you aren't doing a frame off restoration.
If you do remove the box and the evaporator in the engine section you will see that flange is 2 piece and screwed to the A pillar with 5/16 self tapping screws,
I just bought the 2 piece flange myself, Hard to find , not cheap
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