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There was no such thing as radio delete since the radio was an extra cost option. The heater was another matter since every car came with one so...
FYI, the 4966 was only installed in low performance 440’s. The primaries and secondaries for the high performance 440 carbs are all the same size.
There is somebody out there makes them in aluminum. Back in the day Mopar made them out of cast iron and they used them on the Police Packages.
My 64 Polara 500 Convertable came with a factory AM/FM Radio. but you are correct in that most cars came with AM/PM radios back in the day.