my nieghbor across the street has 2 coronet 440 4dr cars at his dads place just north of athens if i see him out i'll ask him if he wants to part with one
Member Dodge33 on this site parts out alot of western and southern cars. They probably would have what you are looking for - decent people also.
Those parts should be the same as 68 to 70 and are available new from AMD.
I have an excellent rust free complete front structure already correctly removed from a 69 PM me if interested