Starting a new project car and need help with parts interchangeability

The 73 K-frame it self will not fit your Barracuda but the disc brake parts will as said above. If your Barracuda isn't a V8 you will need to find a V8 center link for it. The later ones won't work. You also need to do some research on what oil pan it takes to put a 360 in your Barracuda. I have read posts about the oil pan differences/issues but don't recall the details.