Hi Guys<BR>I have a 65 Electra 225 conv. I put a dual master cyl. in it, using one from a 67 Electra. You do not need a proportioning valve as long as you keep 4 wheel drums. Prop. valve is needed with front disks rear drums. The dual master for a disk system is a bit different in that it has some kind of valving in it. Now if you put a dual master in your riv, you just need to make the plumbing work, I used a splitting block from a 65 wildcat, plugged one side, and joined the rear lines to that. The front lines kept the same splitting block, and I plugged one hole in that one too. <P>This seems to work great, and it has already saved me headache, because i have blown a front brake hose, and could have lost all four wheels. <P>Drop me an email if I can help, good luck!<P>Jim<P>