I can tell you that I actually settled a claim on a GT with State Farm actual cash value policy. It was a very smooth process and a very fair settlement for the value based on then current market values. Its not that hard to document the value of a GT, they are not that rare. Really no need to pay 2x the price for the same insurance value.
Make damn sure you know what the term "actual value" or "actual cash value" means. In most insurance lingo, it ain't what you think. It usually means, the value of a car being sold to a dealer; in other words, the wholesale price, or the trade-in price. That is not the price at which most of us can buy one in the open market. I had bad experiences with State Farm, and swore off ever doing business with them 30 years ago.