Can I use a master cylinder off a car with disc/drum on a disc/disc conversion?

I assume that is inside the M/C itself? Is there a diagram somewhere showing this? Thanks!

This is well documented, and is in all the service manuals. Download one from MyMopar



you can use small sheet metal screws forced into the seats to pull them out with a claw hammer. I used my original 67 master with 4x disk brakes. I didn't even remove them!!! I just took a nail and punctured 'em from the outside LOL