Most people who swap a different engine into a Triumph Spitfire will do so to gain more horse power and reliability. This builder certainly has the more horsepower covered but reliability … I don’t know. He has chosen the Maserati Bi-turbo V6. Curious choice as they are maintenance intensive and don’t make huge power compared to a modern V6. But it certainly is one of a kind.
The builder says suspension and rear axle is also Bi-turbo so at least the rear axle will survive the power when the engine is running well.