This is a 4 door volumetrico a seriously fast 4 door in its day and rare, you can't compare prices of one of these with a 4 door twin cam 8v supermirafiori.
I think the price is fair, as good condition Sport money is between 8k and 10k although to be fair you can get a Racing for the same money but your stuck with LHD again

Its only flaw for me is that its LHD and I just think for UK driving its just a pain in the ass, but that's just my opinion, some folks are quite happy to drive them in the UK.