I'm not trying to offend you, but if you get $3k I would take it and run. Realistically I think it would be worth 2-$2.5k.

180B's are no 1600, 240K or 1200 for that matter. They're just not worth the same money. I had one that was identical to yours but one owner, log book, original sales reciepts etc etc and sold it for $1500 unregistered about 4 years ago. A fella in Sydney bought it and added whitewalls, alarm, electronic ignition, and lowered it. Eventually he onsold it for somewhere around the $4k mark, but it was a pristine example.

Here's a pic of it after I sold it.



Just don't expect too much for it. Sell the wheels separately and add orginals and you'll still probably see the same money.