1972 duster 340 value / worth ?

Any time you buy a "done" car, it is a gamble. Seller's receipts, a truthful seller, good dialogue between buyer and seller. A must really for most.
When YOU build a car, YOU know what work and parts have been used. But how many hours/years will it take for you to get it done? There are reasons you will always find half done projects for sale.