What should be done with this 70 340 Duster

the last 6 digits of the sequence number of the VIN # are stamped on the core support and the package tray and usually somewhere on the trunk lip rail. then there is the engine block/trans , the fender tag, the broadcast sheet and the door sticker. i know this to be true for B Bodies. i am fairly new to the A body world, but im reasonably sure Ma mopar wouldnt have deviated to far from this. and im pretty sure this is going to be from 68 and up, but im not positive. complete body and number changes happen every day , and people are saving cars doing this.