I had one at one point and it ruled! I thought I was the only person to have one in the states. Guess now your #2 I looked it up for fun when I had it to see what they sold for new it was something like $850. It's Super rare so that's gotta be worth something. I'd ask a lot and see what happens.
If I still had a natural aspirated NA, I would offer you 500. But I have no use for it at the time. Good Luck to who ever gets it. I was looking at them not to long ago and since you can't get them and a new one was about 900 + tax, I say its about 500 and up dollar range for the condition it sits at now.