It should work just fine. It will raise your speed limiter from the factory 105mph to over 120+, not sure of the exact speed. (The Marquis and Civilian Vics are limited by the steel driveshaft, it has a vibration dampener on it that wouldn't like spinning that fast

)
It is also going to give you more agressive timing, later/firmer shifts, and raise your idle speed a couple hundred RPM.