Ryan,
You asked about the location of the "internal" residual valves. If provided, they are behind the tube seat insert, along with a little spring. To see if you have them take a paper clip or similar small diameter object (butt end of a small drill bit works good) and slowly push it into the output ports. If you feel a spongy resistance, you are pushing against a residual. If none are present, the object will easily go into the master bore.

There is a lot of info published about rebuilders not installing internal residual valves when they refurbish cores, because they pretty much disappeared from use with disc/disc, master on firewall applications. Here's a crappy old picture that shows where they reside, if installed. People removed them by putting a big sheet metal screw gently into the brass tube seat, gently prying it out, and then pushing it back in place. Doesn't damage the seating surface if done carefully....

master.jpg