is it possible to swap a legnum motor into a tl magna and waht would be needed if it is possible

Yes it is possible, make sure to get front cut of a car, with ECU, wiring harness, basically as much as you can, one would wonder though those only pump out just over 200KW, basically any supercharger kit either raptor or rotrex will give you much more then that & considering high labour costs in fitting the engine this would not be money well spent.... unless you can pick it up dirt chep then go for it.....

I believe you will need custom mounts to be fabricated. This will be quite costly in labour and engineering fees.