4.6 will fit the 96 up cars... k member that is. you will have ALOT OF WORK TO DO and you will be really really sorry you did it unless you have experience with swaps its not easy, alot of head aches and your resale value will be POOP i mean would you buy some doods v6 that put in a 4.6 from a gt? i know i wouldnt.... i would sell the car adn buy a older notch back for cheap.