3.23's don't bring quite as much money as 3.55's do but since it's the 489 case that helps some. Type of sure-grip will determine the final price. As long as you have a 8-3/4 in the car now the driveshaft length will be the same but there are a few different yokes used. The large majority of A-body cars use the small 7260 U-joint. Make sure and ask what yoke it has and if he's not sure measure yours and have him measure his and compare. Even if your car has a small U-joint and his has the large u-joint you can use it by changing your rear u-joint to the 7260 to 7290 conversion u-joint, but that's added extra cost and labor so keep that in mind.