Bought a duster shell , vin # is on a blacklist , now what ?

OP has still not answered the "big question."

Is the dash frame in the car and is the VIN tag on the dash? Further, most all these cars (after 68) had additional body stampings with the partial VIN, usually on the rad support and the rear fender/ trunk lip. DO YOU have the title?

OldManMopar claims (and I'm not disputing, he knows his stuff) that there were some Dusters manufactured WITHOUT additional body stampings.