1973 Duster 340 Clone, Whats it Worth

Duster_71 said

Originally, the owner said it was a 340 out of a 71 Demon and when I crawled under it I seen the casting # ending in 340-3, I told the guy that there was no way that 340 was originally out of a 71 Demon and he said at least it’s a 340. I don’t think he knows the difference between the motors.

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That "340-3" number denotes a 340 ci motor with a "3" casting quality. The casting quality is the last digit and is rated between "1" and "8", with "1" being the best casting quality with low porosity. It very well could be out of a 1971. You would need to check the rest of the numbers.