Just a word of warning on this deal. Most of the 6060 gearboxes are configured for some funky stuff, like a shifter that is 42-45" from the block (your A-body is about 26" block to shifter). They also have oddball speedo drives (Viper boxes don't even have a speedo drive since the speedometer in the Viper car was diff driven). I am just scratching the surface, but suffice it to say that you will be jumping some hurdles and spending some cash to get one in your car.
That said, there is nothing wrong with any of these gearboxes from a quality or durability standpoint. They are very, very good transmissions. Just be careful with estimating the cost of actually getting one in the car and running down the road. If you can get it all done for a good buck you will be happy with the way they shift and stay together.
