400BTC = $200k US at the lowest value in the last month. I do know enough about cars to know that the one you're trying to sell is not worth anywhere near that.
Barrett Jackson sold one for $275k http://www.barrett-jackson.com/application/onlinesubmission/lotdetails.aspx?ln=5048&aid=466

This dealership was asking $160k. http://www.rkmotorscharlotte.com/sales/inventory/sold/1969-Ford-Mustang/132894#!/

So assuming yours is show car quality, you're still 40-60% over priced.