That car is a bunch of mismatched parts not original to the car --- it makes anyone who knows what factory 1970 Duster 340s looked like and came equipped with - think about whether the car has a lot of hidden issues. So much wrong with this car just from the limited photos --- the grill (missing turn signal lens - drivers side) is from a later Duster model not a 340, the wrong and cheap looking stripes, the air cleaner is from a later Duster 340, the trunk lid is from a later model Duster, the front fenders look like 1972 Duster fenders (see the side marker lights), the rear quarters, trunk and rear marker light on passenger side look very suspect, the exterior mirrors are aftermarket junk, the windshield washer bottle and associated plumbing/squirters are missing - the overall look of everything under the hood makes me wonder what history this car has (fender tag missing?). This car may have a whole front clip off of a 1972 Duster. These issues are probably just the tip of the iceberg as far as what is wrong with the car compared to a factory original 1970 Duster 340. It might take a lot to make the car more original looking. Currently, there is nothing cohesive about the presentation.
A close personal inspection by a knowledgeable Mopar 340 Duster person would be in order before deciding whether this car is a really worth the effort and the asking price.
