VIN showing up as a van..

[Nin92]

Hey yall I've been around for a bit looking at all the useful information on here, but I recently made a purchase of a 1974 K10 Chevrolet (VIN shows 76) and have ran into a problem with insurance. I bought the truck from Alabama and I am a Florida resident so all that is required for me to get a title is a bill of sale and a copy of Alabama registration. Well I needed to get proof of insurance before I registered it, but my insurance company says the VIN is that of a Sportvan/g10... I've ran the VIN multiple times with GM Sheets and its clearly a truck. I was curious what I can do to remedy this problem? Much appreciated

The VIN is
CKL146F361296