You could look at this kit
http://ecihotrodbrakes.com/dodge_plymouth_discbrake_conversions.htmlI spoke with the owner at Carlisle a few years ago and he said it will work with the drum brake booster because the GM calipers it uses have pistons that are much larger than Mopar ones and don't require as much pressure to get the same clamping force.
Nice looking kit. Laser cut brackets, ( the Scarebird brackets if they haven't updated them look like at least 2 pieces welded together) aluminum hubs and it uses your drum brake spindles. 13" rotors optional.
For the ultimate you need to call member AndyF
http://www.arengineering.com/caliper/viper2/viper_ab13.html for one of his Viper kits.
He doesn't list a kit for a C-body but I have heard of guys adapting a Wilwood B-body kit to a C-body by either drilling out an existing hole or relocating one in the bracket so maybe he could do the same.
Kevin
