Reason I posted the pic is so you can see what a Mopar power brake setup should look like. Notice the bell crank setup at the right. That is what MaMopar used to hook the brake pedal to the booster. By design it gives you an increase in mechanical advantage over a straight pushrod, meaning you don't need to press as hard on the pedal. If you don't have that, your power booster is not going to be as easy as you want. Before you buy another power set up, try a master cylinder from a '74 Charger with manual disc brakes. The last one I bought was 25 bucks at the corner parts store. It will bolt to the firewall without any mods and use your existing stock push rod. That old Charger had the best feeling brakes I have ever put a foot to and has been on every Mopar I have owned since, including a couple of A bodies. I have no problems with it and I have an artificial knee.