another thing to consider with classic or antique insurance, is driving restrictions. I was told by several of the specialty insurance companies out there that if insured with them I would not be able to haul or tow with my truck, mileage would be restricted, and use would be restricted to shows, club meets, maintenance, and club functions. Basically, no daily use.
I went with progressive, and did an agreed value policy. No restrictions, and if something happens they repair or replace, whichever is cheaper, up to the agreed amount. As it is a secondary vehicle, the rates are very do-able.