The 11.75" rotor with corresponding caliper adapter works great. Cordobas are good donors for both and the adapter is compatible with the F body calipers.

I've run this setup on several A bodies, an M body and a 64 300 I converted to discs. Also on my 38 Plymouth (that was an entire front suspension swap though).

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.