Are these valve covers factory?

I was looking around on barn finds, I think, and came across this demon. supposedly a 72 340 car. the spark plug wire holders caught my eye and I wondered if these are factory or if someone has maybe welded those wire holders on.

1972-Dodge-Dart-Demon-3.jpg

Ive looked at a lot of photos and haven't seen any other valve covers with the wire holders where they are.
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