If the advert is honest, I would say it isn't a bad price as you say for it's rarity! My brother and his went along with his friend to go and see one when they were both at University back in the mid eighties, It was up for 5k and when they went to view it the owner wasn't there and left it with his father. when they met the father (who clearly didn't know about these cars) said........." He told me he wants 5k but looking at it, it is a bit rough and an old car now, so he probably meant £500 and not 5k" ................The deal was done!!