It isn't going to be difficult to insure your car in the UK due to it being left hand drive. There are heaps and heaps of US and EU cars, both modern and classic, being driven in the UK.
As to cost?, not sure as I've never looked into it. You probably won't get a favourable quote from a run-of-the-mill insurer, but if you were to look around at various insurers advertised in classic/American/kit car magazines, you may get something a bit more reasonable.
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