Stop in for a cup of coffee

Didn't they change the diameter of the torque converter snout in 66??? You would need to match the converter and trans...

How are you going to shift the trans? The 63 is push button/cable shift, where 67 is linkages... You would need to work out the shifting...
i would be using the engine from the barracuda with a later 3 speed trans. ....so it will have a floor shifter and use the later slip yoke driveshaft and most likely the rear end from the barracuda as well