66 Barracuda
Well Andy, I can tell you that's it is a more involved job than just changing the cluster from Valiant to Barracuda. The entire dash frame cutout is different and will need to be modified to fit the Cuda cluster.'then you will need to find a Barracuda underdash wiring harness as the Valiant and Barracuda plug and gauge configuration is different as well.
I'm doing the same exact thing with my convertible Valiant/Barracuda clone project. When the storm passes and I can get on the big computer ill add a pic of the difference in the dash frames!! Geof