I'd like to add to this thread as I have some questions and am looking for any updates from people who have them on their Mopars.
I was at the Spring Fling on Saturday with Johnny Dart and we saw the setup on Kenny Wayne Shepard's Duster that was featured in MoparMuscle at one time. We talked with Kenny and he said it was one of the best things he has added to his car. He did not install it himself but we were able to inspect it. It looked like a great unit and it had much more clearance that a fat brake vacuum booster. He said it worked flawlessly on a recent Power Tour.
I have sourced some parts and Napa sells a reman unit for about $175. Napa can also fabricate the necessary high pressure PS lines as well. The low pressure return lines should be easy to make using your existing line and a "T" piece. Not sure what that the cost is but it has to be cheaper that the SS braided hoses in some of the kits I looked at. The only other thing is making a bracket for the firewall. I'm sure you can fab something machined out of aluminum if you take the drawing to a machinist. I've seen an adapter plate for $75 for all a-bodies 64-up. The master cyclinder is another part you'll have to get as well. I think the larger bore disk/drum MCs have higher stopping power. Kenny's had a the mopar unit that had the plastic reservoir. Can be used with the traditional cast iron but I'd rather have the light weight aluminum. The other part is modifying you the brake pedal push rod. I was palnning on using a clevis bolt so it's adjustible. Also you need the pushrod and spring going from the MC to the Hydroboost. I think you can get those items from a GM/Chevy dealership. Or get it from a junkyard. One more thing is an adjustible prop valve.
As far as sourcing from a junkyard I think the mid-90's Chevy Astro Van/Safari a good donors.
Cost for all this looks to be around $400 unless you get a used Hydroboost from a junkyard cheap. Pricy but may be a good way to go if you what better stopping with a big cam and low vacuum.
Redfastback Steve. Any tips you could give on the setup?
