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heh if you have the money you can fit bugattis w16 in there... but the largest I've seen on most gt's is a 5.4l either big bore 2v or a 5.4l dohc go search online for the prices.. then take that price and multiply it by 2.. that is what your looking at to drop a bigger engine in your car.
Its really not worth it to switch out the engine unless you really got the money or you just want a project. i really would just go sell my GT and buy a car that comes with a 4v forged motor. A S/C GT will put down anywhere from 360-420+. That really should be enough power if your car is a DD.