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Pipe dreams. That car isn't smart enough for changes. Bad platform.
The Jaguar looks a lot like a Griffith. Here's a 1965 Griffith, powered by a H.O. 289 Ford:
I knew a guy who had a TVR/Griffith before they put the 289 motor in it. With that heavy V8 the Griffith would slide straight thru a tight corner. Sunbeam Tiger had handling issues too. Also met a guy who raced an AC Bristol before they made it an AC Cobra with that 260/289 Ford V8.
In say the Smart motor isn't powerful enough to propel those big car tires....