Help... Vin #'s dont match

This is my first post,
I guess I'm in a kind of a pickle... I've always wanted an old Mopar, and I found a 1972 Duster 340 (or what I thought was a 340 car).

The car had sat for a few years and I bought it from a woman who said it belonged to her husband, who had a stroke and is in assisted living...

I got it running and have been part hunting and doing a little reading, that made me do a little more looking..

Anyways, Dash vin matches title, and it is a H code. I do have a title in my name now. The stamp on core support matches but looks fishy, Vin on rear deck lid by speaker hole DOES NOT match. NO fender tag

Has a 340 from a 1970 Vin obviously doesn't match, 727 trans from a 1972 B body Vin doesn't match, Does have a 8 3/4 rear unknown numbers....

I mean its a solid car and for the most part complete, but what am I supposed to do knowing that the vins don't match..

The woman I bought it from isn't returning my calls.....


Please any advise would be helpful... I paid kinda a lot for the car and don't really want to lose what I have into it but don't want to do anything illegal...