Keep listing it on ebay as 1 week isn't enough exposure. Try adding a buy it now price equal to what your reserve was so people have an idea of what you expect it to sell for. If no luck then add a "OBO" to the listing and consider realistic offers. With something so nice but also so rare you just need more exposure. Also be ready to have some yahoo make a ridiculous offer you'll have to turn down, just know that more than likely they are flippers looking to make a buck off a quick turnaround. Gas Pig and a few others who have done amazing resto's on 66's would probably have paid your premium but at this time perhaps nobody is performing such high end resto's. Timing is everything. Try asking for trades if you have other needs you'd be willing to trade it for ie...motorcycle, quad, boat, motor, tractor, jetski, trailer, etc...
