$20k 77 DL ?

First off merry xmas and a happy new year to all. I think the reason the person wants so much for the car is to recover what he spent on it. And thats not the way it works. Its not original for a start but I am sure it is a nice example anyway. We didn't get that model here and to have one, awesome. We were offered $9000us for the GSR about a year ago, and it is a very rear car, more so than the 77DL. The GSR is a 72 model and almost original apart from the paint. What do you think its worth as I am sure I could get between $5000nz to $8000nz, as early mitzy 70s GTOs in good nick are fetching up to $7000nz and there are more of them around.