radio interchange question

Also I've never seen a Dart script on a 70. Dodge script yes which I have some.

I use the term script to refer to any chromed pot metal name on the car. 70 Darts had "Dart" on the upper quarter panels along with a Swinger or Custom or as part of a single Dart GT badge. Many of the catalogs show a different Dart nameplate that I think goes on a Dart between 67 to 69 (don't know specifics), but that nameplate never appeared in 1970.