Paul,
Original drivetrain cars can be more valueable----- depending on condition and desireability. If this is a "Barracuda" that someone restored and placed a 440 in it, I would say it was likely a good choice in cloning it. As for value, of course it will never be worth as much as the real deal, but then again, there is a place in this world for clones because they are affordable and thus---- we get to drive them! I don't know the value of the car, but I'm thinking you couldn't build it for that much, so if you have checked it out and it runs strong, is rust free and needs little tlc, he's likely in the correct price range. Shop around for comparables and if nothing else is measuring up, then make him an offer at maybe 10 to 25% off his asking price and see where it goes. Know your limits and stick to them.
Best, Charlie
70 Challenger
69 Camaro RS