as far as i know the engine is all original no modifacations not sure what the rear end ratio is but the car is auto 351 2vHowdy!
Mostly it depends on what you are starting with and what your plans are. How much gas milage are you willing to give up and what kind of driving you do.
It would be helpful to know the engine/transmission and rear end ratio. If the engine has any performance modifications that would be good to know. Also, if you know how many miles are on each.
Generally, if you want a quick performance increase you should swap out the rear end gears for a 'higher' ratio. So if you have a 2.73 then a 3.00 or 3.25 woudl be a 'higher' gear ratio. This is pretty inexpensive and effective for most any car. This will help the car get going quicker but will reduce your overall top speed and will decrease your gas milage too.
If you want both quicker and faster you will need to look at engine upgrades or transmission swaps. Engine upgrade costs will vary widely. A tranmission swap is never inexpensive.
Most engines do better with an upgraded ignition system. (If you have points now). You also can get more performance by swapping a 4bbl carb on in place of a 2bbl. This isn't too expensive. After that I would look at dual exhausts (not too expensive) and headers. That's pretty much it for external bolt on.
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