Is there a computer program that will simulate modifications to a 1984 Mercury Grand Marquis?

I have a 1984 Mercury Grand Marquis and I am planning on altering some things on the car itself for better gas mileage, more speed and what not and I was wondering if there was some sort of computer program that I could simulate the changes to my car in and see how it would run and what the change would improve or harm so I can figure out what it is that I want to do to my car and then go ahead and execute the changes without much concern. If anyone knows of a program like that then please tell me its name and/or where I can find it. Also if you know that there is no such program that can simulate changes on my specific car please tell me that as well.

Is there a computer program that will simulate modifications to a 1984 Mercury Grand Marquis?
I've never heard of such a program. I doubt one exists. On a car that old the variables would be in the hundreds. If you post what your planning on doing to the vehicle I can probably tell you what kind of improvements you're looking at.
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