I use Hagerty (http://www.hagerty.com/
). They are a good company. I had an 'agreed value' policy for 35k that cost me $273 a year. There was no deductible and the only stipulations were that you had a primary vehicle, and nuclear destruction was not covered. There was no mileage limitation or driving stipulations. Their attitude is: 'These are peoples babies and we know they are going to take care of them and make sure they're safe'.
I got tapped in the rear before I sold my '74 and they felt that the other guys insurance wasn't giving me enough to properly fix the damage so they gve me a supplement and it didn't affect my rate.
I still use Hagerty for my '86 5-S, but it falls under a different category than my '74 because it is not yet 25 years old. Same policy, much higher agreed amount, much higher (yet still very reasonable) premium. On top of all this, I get flatbed service and other amenities.
I say you at least check them out. Good luck!