66 and 1967 B bodies are reasonable enough, all the same underpinnings, Coronets and Belvederes
Coronets and Belvederes are hard to find, I’ve not seen any for a doable price , but at least you can get parts. A four door Dart or Valant could be a reasonably priced A body option, though you really have to beef up the suspension f yu upgrade the 225 or 273 that came stock in the earlier models.