Disk brake help

So after being sick with a respiratory infection for 3 weeks, not to mention the 40 an below rainy weather, I finally felt well enough to work on the Demon again. I'm tearing into the front end but I need some help identifying/ advice on the front brakes. I don't know if this was a conversion to disk or if its original. This 71 Demon originally had a 225 with A/C now a 318 (I had to find a vacuum tree and heater valve to get the vents working and heater works properly so I do have the port to add in a booster), small bolt pattern with all right hand bolts (lucky for me it was engraved on the wheel nuts). Rear drum brakes size at this time unknown. I think the disks are 11" disks but I could be wrong. Its hard to measure them on the car. Did these come original to this car? It does not have a booster. The disks look to be in good shape and the pads have plenty of meat on them. I'm looking at doing a front end rebuild with a PST Polygraphite Super Front End Kit ($439.00) from ebay and I don't want to run into any trouble. I have done a rebuild like this before but it was on my unmolested 70 Duster with all drum. Pic shows what I'm working with, I sprayed it all down with Liquid Wrench.

Thoughts? Advise please.