Unrestored 1970 LS6 What's it Worth

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I'm looking at an 1970 Chevelle LS6 a friend of a friend has and may be thinking about selling. I'm having a little trouble making my mind up as to what it's worth. I'm going back to take some pictures tomorrow. When I first say the car it was hard to believe it was an unrestored / survivor car. However everything I've seen indicates it is.

Here's the low down on the car.

17,000 original documented miles
Unrestored (strong #2-1/2 car)
Original Forest Green Paint Black Stripes (paint is very very nice)
Zero Rust
Undercarriage is very nice, clean with some original markings. Has had some spray paint taken to the floor pans.
Original Black Bench interior (like new)
Auto
Everything under the hood and drive train checks out to be numbers matching, casting number and date code correct
POP
Build sheet

I'll attach some pics as soon as I have them.

Any ideas???

Rick