Monika.
I believe your hopes are unrealistic. What you propose would be an an enormous job because not only would the engine have to be changed, but you would also need numerous sensors and their associated electronics, a complete wiring loom, and a complete exhaust system. Depending on what engine you select you may also need modified engine mountings, new front springs & dampers, new gearbox & drive shafts. Even if you find somebody willing to do it, the cost would be enormous.