I wouldn't worry too much about the description of the car on insurance documents.
There was a rumour going around a while back that if the description of the car on the insurance documentation did not match that on the V5C the insurance was invalid. This worried me as, of the cars I had at the time, only my Ford Mondeo had matching descriptions, so I checked with my insurance company and they confirmed that my car insurance was based on the registration number and not the car description.
If you go with one of the recognised Kit car insurers they will be familiar with your type of vehicle.
I would phone around to get the best quote, how they assign a particular premium is a mystery to me, I'm currently with A plan and Graham Sykes but I change providers almost every year as I can usually get a better deal elsewhere.
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