In order to make an assessment you would need to know more about each car. First, are both original purple cars? Second, is the 'Cuda really a Cuda or barracuda gran coupe with Cuda badging and added options? What about the tranny's both auto's or is one a four speed? What about other options, can you get the information from the data plates, there are so many possibilities here with options that can make one more valuable than the other? Finally what everyone else has been saying...what work has been done to the cars already, what has been done to the motor, body, etc...
Basically you need a lot more information about both cars to assess each cars relative value and their comparitive value.