I have State Farm and have quite a few "classic" vehicles insured with them. In Ohio the procedure with them is simple: You determine an agreed upon value for the vehicle. This can be done through a vehicle appraiser or dealer. This, together with several pictures, front, rear, side and 3/4 view, will be the base for your policy and your premium. Depending on your policy selection and deductible, you will be covered. I found the "usual" classic/collector insurances way too expensive.