Hagerty has let me name my value and has not balked a bit. When I insured my '63 I said lets go with 8K agreed value. They said fine. The cost difference between the 6k and 8K was something like $10/year. I think they are used to cars being insured at many times that price. I did have a car totaled while insured by Hagerty and they were awesome, cut me a check quickly and were fine to work with but be sure to understand the car can't be used as a daily driver, at least not technically, and if it is totaled in "normal use", ie; commuting to work, they "could" technically deny your claim, or so I'm told. My latest toy ('81 Fiat x1/9) I did not register as historical nor did I get a Hagerty policy simply because I intend to use it as a daily driver. I learned my lesson on the one that got totaled, I insured it for about what it was "worth" but that really isn't what you should do, you should insure it at a "replacement value" which isn't the same thing, to me, that's the cost of getting another similar vehicle in equally good condition immediately, which you will likely have to pay more for. I could not get another Opel GT in equal condition to the one I lost without looking nationwide and traveling and "fighting" for it for a long time. In other words, I say insure it at what it's "worth" plus the cost to get one fast, shipped in and all that. Current market value and another $1,500-$2,000 Hagerty shouldn't have a problem with whatever you come up with.