I had a falling out with Grundy after they told me that under their policies, my 79 Alfa and 78 Porsche would only be covered for parades, to/from cars shows, and in storage. That any sort of regular vehicle usage and they wouldn't be covered.
I have my regular cars insured with State Farm and they wrote me a policy for the 968 and Beck with an agreed value of $25K, and the only limitations is <5,000miles/year and any kind of competition. They're both dirt cheap compared to Grundy and Haggarty. ~$150/year.