Viability of the Napier Lion as a tank engine in World War 2?

In case you wondered what it was.

NapierLion513831stassy23.jpg
 
OK it's an ex aircraft engine that has infact been used for cars, so I doubt it's much of a leap for tanks, real question is how early, how does it affect tank development?

Maybe the Covenanter gets one, reliable engine, dodgy suspension etc, latter gets fixed in lager model resulting in reliable (by british standards) cruiser tank. British appreciate the value of sloped armour much earlier than OTL.
 
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