A guy on another forum posted this.

Ok guys I never post in here so I am askign for help. I was emailed by a guy wanting to do some sort of a deal on my LT4 car plus cash. He is offering me a 89 20th Anniversary Turbo Trans Am Pace Car has 5,800 original miles... What is this car worth?

 

They vary somewhat depending on condition and options... the most common ones are T-tops and leather, least common are hardtop and cloth.... they seem to go anywhere from $9000 to $20000 most of the time.... 5800 is not alot of miles, maybe too few, if you intend to drive it alot, it probably has all the usual car that's set up problems; but who knows? Personally i can build a motor that'll outrun a LT4, but i'd have a hard time building a TTA, I'd give it serious thought, I'd at least look at the car.

 

The key difference in this instance is the LT4 was one of 100 or so to roll out of SLP with that powerplant.