65 Barracuda Brakes... Help
I just did the Scarebird drum to disc conversion on my 65 Valiant which should be nearly identical to your Cuda. I have about $500 in the complete job including new steel lines throughout and master cylinder. I was able to use stock steel 14" wheels with small bolt pattern. Mine was very much a budget minded conversion. I have a complete writeup linked in the following thread.
http://www.forabodiesonly.com/mopar/showthread.php?t=165237