Hi
If it is cheap, buy it. You will probably need it in some point of Your life.
1970 is originally points distributor (with no pickup, I'm confused). The frame is the same as later models, but upper shaft and moving part of the baseplate is different. Could You share a picture of Your 1970 distributor interiors?
Do You have an electric ignition conversion with Mopar parts in Your car? Parts from any B/RB electronic ignition distributor interchange. All parts can be dropped into any frame, but it is also possible to drop in a new distributor entirely as long as it belongs to 440 (RB-block).
Further help available in native language by PM/phone.