Just what a 1 minute search on FB revealed for 4 dr /6 cars ...
Marketplace - 1973 Plymouth Valiant | Facebook typical listing.... 4 door /6 - clean nice driver = 6900 ??
Or... a smashed up one with rust for 4k ???
Marketplace - 1972 Plymouth Valiant | Facebook
Or... this nice little 4 dr for 3500??
Marketplace - 1964 Plymouth Plymouth Voyager | Facebook