If you wanna go fast in a straight line, **** the 240 and get a Mustang.
Buy a F-Body for like next to nothing, supercharge that sucker and off you go.
Or you can do what I wanna do... supercharge, fix up the suspension on a F-Body and go take that sucker sideways. (Push gas pedal, turn wheel sharply, smile and grin)
Do whatever works for you. Do not listen to people who have nothing of value to say. Most of these people have never driven a Mustang so I don't understand how they can profess to hate a car they have never driven. (That statement does not apply for everyone -- note how I said "most") Shrugh.
Good luck