1970 "DUPED" Dart Swinger

You mean on the timing cover? I normally don't endorse RTV on a gasket, but on the small block Mopar timing cover I do. THey're bad about getting small pits in the gasket surface over time and a thin layer of RTV won't hurt a thing, especially around the water holes. Just one peon's opinion.
One of the main reasons I started this project is there was a coolant leak coming from the timing cover. The area I found to be leaking was directly under the cooling passage on the passenger side. The gasket appeared to be just falling apart in that area.