WIW All Original 74 Duster 360 4 Speed Car?

I think the real winner in this deal was the previous owner of the car. Present owner laid out a good amount of change for this 74 in a , "I can drive it for awhile and get my money back" scenario, and it hasn't materialized. Now it's time to sell and after 2.5 years of trying the owner now doesn't want to take a big loss on it. I'm like most of the responses I've gotten in that I think $15K is a good price for the car. I've offered $16.5 without the rims and tires, which aren't original to it anyhow, Because I really like the car as a whole. My thought was popping another $1k at it to try and buy it, the reason for my post and to get more opinions on the subject from real A Body people who know the cars. Besides my maroon 74 Duster I've mentioned and a 68 Fastback Barracuda I've sold recently. My present 69 Fastback Formula S have been my only A bodies for 40 years of Mopar.