conversion-single master cylinder to dual

+1 for dan . . . I just did this over the weekend. Got a '66 cuda with 4 wheel manual drums, went with the 1.03 bore alum duel res MC from mancini's. I took out the old distribution block and then used a coupler to run the rear line right to the MC. For the front brakes I had an extra T coupler (the one used for the rear axle to split the brake lines to both rear tires). So rear brakes right to the MC and T for front brakes. Also note, with using the Mancini's master cylinder, its designed for Disk brakes and you have to use a 10psi residual pressure valve for each line out of the MC. I'll post some photos tomorrow to show how I did this, but its simply brake line from the MC, do the 90* bend down and install the pressure valves inline while the brake lines are on their way down infront of the firewall.
The 10psi valves are an extra 20 bucks each but for drums you need 'em. They keep 10psi of pressure in the lines so that the drum brake springs don't return the shoes too far. I've been told you can run without these but then there's much more peddle travel and it's actually possible for the wheel cylinders to leak fluid because they retract too far. (or something like that haha)

But no prop valve needed if its 4 wheel drums, only if disk/drums.