I'd guess somewhere in the 35K to 45K range, but I see them go for higher sometimes on ebay.

 

NADA says, this is 69 Mach1, 428CJ, Ram Air:

Low Retail: $14,958
Average Retail: $31,620
High Retail: $57,350

For the same car with the SCJ add 65% rather than the 40% for the CJ.

MIke

 

Be careful using NADA prices as a reference, IMHO they are always considerably higher than what the market is actualy paying for a given car.
My 02 cents.
Paul.

 

You can find them for between 30 and 40K, but watch them. I think the value is going to appreciate nicely over the next couple of years. Jack.