68SS, I just went with Hagerty. Try www.hagerty.com
The rates are low, they don't seem to be picky about mileage, full coverage with no deductible, works on an agreed value. They have the NADA guide right on their web page so you can check that out.
Only draw back is the car has to be parked in a locked garage.
69' X-11 350, Turbo 350, Factory Air, PS, PB, 12 Bolt (410 gear) & NOT AN SS