Sorry for taking so long to get back, the problem was I had the calipers on the wrong side. My father-in-law has a 68 Coronet R/T with a disc brake conversion and I put my calipers on the same way he did but it wouldn't work for me. as soon as I swapped sides I had pressure building up. My banjo bolts are right under the control arm and his is closer to the steering tie rod bars. Hopefully this will help out someone else, so if you can pump up the brakes real fast and get pressure then let off and lose pressure then you might want to swap your calipers around. And i'm using the proportioning block that origionally came on the car, but haven't had enough time to drive it hopefully that will be tomorrow to see how the brakes feel without a proportional valve.