i think it's supposed to be turbo- look how the word is being used.
In response to chico20, the general consensus in various other posts is that it can be done, but it would be cheaper to work the current motor due to requiring: complete engine, new wiring loom, new computer, possible body work to accomodate taller head, etc. Most of the advice I've seen has been something along the lines of turbo the motor that's in there now- cheaper and just as effective.
1987 Jaguar Sovereign - Metallic Green
3.6L DOHC 24 Valve