Comps are comparable cars for sale sale right now, that's why the specific features matter to getting a settlement if the vehicle is a total loss; the only scenario where an opinion site would be used would be if no comps exist in the market to use as a basis.
That won't be the case with an EFI/Overdrive modified 65 El Camino in very good shape; there are literally hundreds that meet that description available at any given time for sale.
They offered under 15k, I would bet there is not a single 65 El Camino in great shape with an EFI/Overdrive upgraded powertrain and disc brakes for sale at that price anywhere in the United States right now; the insurance company won't find any actual comps to challenge the ones you find as long as you are diligent to not ignore the average and just try to use the exceptions.
That won't be the case with an EFI/Overdrive modified 65 El Camino in very good shape; there are literally hundreds that meet that description available at any given time for sale.
They offered under 15k, I would bet there is not a single 65 El Camino in great shape with an EFI/Overdrive upgraded powertrain and disc brakes for sale at that price anywhere in the United States right now; the insurance company won't find any actual comps to challenge the ones you find as long as you are diligent to not ignore the average and just try to use the exceptions.