To be absolutely certain, you should:
* Consult a 1969 Dodge 440 engine diagram or repair manual. These will have a detailed illustration showing the location of all sensors and components. A factory service manual is the best resource.
* Look carefully at your engine block. The sender is usually a relatively small fitting with one or two wires connected to it.
If you still can't find it after checking these resources, a picture of your engine bay would be helpful for someone familiar with these engines to assist.