Duped

Ok here is my story and Im looking for feedback before I go and sell this car for parts only. I have done my research and found out that the car I have is a 73 duster. I bough this car about year ago from a guy on craigslist. I was new to mopars and what to look for regarding the vin.the title stated it was a 76 and thats what the guy listed it as. The car came as a rolling chassis from what looks like it was in the process of becoming a drag car. I started my project and was going towards starting a demon tribute car. The car had no dash and the vin on the title matched the radiator support and door.But after further inspection it did not match the package tray that number came back as a 73. I also noticed that the rear bumper was a 73 and not a 76. It did not have the crash shocks in it. I could not find any other vins on the car anywhere else. I never really noticed it till recently and im pretty well into the build. Build is as follows so far
fully rebuild front suspension
new kyp shocks
New amd Inner fender to cowl braces
big bolt installed
re installed cclip with new inner fenders
filled sanded primed and painted engine bay
Just suspension torsion bars installed
72 dart fenders installed
painted and installed 72 dash
bought aftermarket wheel tubs
bought sherman lower quarter panels
bought amd demon rear tail panel
goodmark trunk pan
amd trunk extensions
installed 8 3/4 rear
custom exhaust
ss leaf springs
freshed up efi 318 with megasquirt and a 904
has weld racing rims
cutout roll cage
dougs headers installed
engine has been freshened up and repainted
new intake filter
new/used front and back windows.
6 pack fiberglass hood
not to include all the parts i have aquired through the year which is more than im goin to list.
i basically have everything for this car to be put back together aside from a shortened drive shaft and shifter with cable.
Since the finding has just recently come to light. I feel like ive been suckered big time and have this sickening feeling in my stomach. As of right now im torn between selling the car for parts only as a whole for less then ive spent in it or completing it and never being able to sell it if i ever wanted to. I would just part it out but i dont have the time to do that with my work schedule the way it is. Ive been to the dmv and they told me i could file for a abandoned car but it would be 30 days to be able to hear back from the previous owners and after that I would then have to put the car up for auction if it doesnt sell in another 30 days I have the option to title it then or crush it. I dont want it to be auctioned and loose time and money into it.I went to the guys house but he no longer lives there and cant even remember what his name was. Whats your guys take I feel caught between a rock and a hard place and need some opinions. Whatever the general opinion is im goin to go that direction.