This Rolls Royce was built by Dan Fink Metalworks several years ago. They modified the chassis to run a 7.0 L LS7 V8 and Corvette C4 suspension. They converted the car to right-hand drive for a customer in Japan. Since then it found its way to Supermachine for some upgrades and repairs. Supermachine lists it as a 1975 version and it appears to be a Silver Shadow.
Source: Black Top Magazine, Supermachine blog and Supermachine FB page