need help to fig out value of a 1972 duster

When I get people that say I don't know when a car is like that one I make sure I ask plenty of questions? Why don't you know is one of them?

i figured since hes owned it for a few years he had to at least learn what engine it had or maby had to buy a part or change oil ,or somthing needed fixed in that time frame to were he had to find out..but he said he still didnt know..so not sure if he really just doesn't know what he has or knows its not a real 340 car.