Try the para titled Automotive in this -
http://en.wikipedia.org/wiki/Rolls-Royce_Merlin
"Around 1990, Jameson [Paul Jameson] began work on a third Merlin-powered car, using a genuine 1930s Rolls-Royce chassis, but this vehicle remained uncompleted at the time of his death."
An authority on RR cars and an owner of an RR-powered Hurricane is Peter Vacher. I've PMd you his email address.