Most companies wouldn't touch mine because it's titled as a "Specially Constructed Vehicle". Those that would, wanted my first born male child. I finally went with Farmer's, who already had my cars anyway. They came in at half what anybody else wanted, $370 a year for full coverage.
The only rub was, they required an appraisal from a builder and/or dealer. My local VW mechanic was more than happy to provide me with what I needed.